979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101
979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101
979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101
979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101 979-0101
计算机与plc通讯时，一般由计算机发命令给plc，启动通信，plc收到命令后自动发回应答。下面给出了命令帧、应答帧以及帧检查的结构。
fcs（frame checksum）表示报头开始到报文结束间所有数据执行逻辑加操作所得的结果。
它由两位ascii码字符组成，每次plc接收到计算机发送过来的一帧数据，即计算其校验和，结果记为fcs2，将fcs2与帧中所包含的fcs1比较，可检查该帧是否有数据错误。如果有数据错误，plc立即发送错误信息给计算机，利用这一机制，有效防止了数据传输错误。
计算机串行通信口初始化
vb的mscomm控件通过串行端口传送和接收数据。因此，可通过对visual basic的mscomm控件的相关属性的设置来对串口进行初始化。
mscomm控件的主要属性如表1
计算机串口初始化程序段如下：
with mscomm1
.portopen = false
.commport = 1 file://设置通信端口号为1
.settings=“9600，n，8，1” file://波特率为9600，不作
file://字符校验，8位数据位，1位停止位
.portopen=true file://打开通信端口
.inputmode=cominputmodebinary file://以字节方式接收数据
end with
plc串行通信口初始化
西门子s7-200可以采用用户定义通信协议（自由口）模式实现计算机与plc、plc与plc的通信。自由口通信是通过用户程序控制s7-200 cpu串行通信口的操作模式。利用自由口模式可实现用户定义通信协议连接多种智能设备。s7-200 cpu自由口的控制字节描述如表2。
plc串口初始化程序如下：
ld sm0.1 file://首次扫描闭合
movb 16#09，smb30 file://初始化自由口，9600波特率，
file://8位数据，无校验
movb 16#e0，smb87 file://初始化接收控制信息，检测信
file://息结束符、空闲线信息条件
movb 16#24，smb88 file://信息字符开始
movb 16#2a，smb89 file://信息字符结束
movb +5，smw90 file://设置空闲线超时时间
movb 200，smb94 file://设置最大允许接收字符数
atch int_0，23 file://设置接收完成中断
atch int_1，9 file://设置发送完成中断
eni file://设置用户中断允许
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zotac z68itx-b-e intel lga 1155 z68 mini-itx wifi motherboard
zoom r24 multi-track recorder interface dvd tutorial
zoom r16 24-bit/96khz multi-track recorder w/ tutorial
ziatech zt88ct60-s328 nspp zt88ct60s328
zenithink zt-180 10.2" android 2.2 tablet pc 4gb 512 mb zepad 1080p hdmi
zenithink zt-180 10.2" android 2.2 tablet pc 4gb 512 mb zepad 1080p hdmi
zebra tlp 2844 label printer b/w direct thermal tlp 2844
zebra tlp 2844 label printer b/w direct thermal tlp
yokogawa ut35-a11201a temperature controller rs422/232
yokogawa p2et6-20j uspp p2et620j
yokogawa model: f3sp20-on programmer module / cpu
yokogawa k9296ba uspp k9296ba
yaskawa mp930 jepmc-io350 i/o module
yaskawa mp920 jepmc-io200 machine controller nib
yaskawa memocon gl120 ddscr-120cpu34100 ver. fob14 cpu20 120 cpu 341 00
yaskawa jepmc-io220 i/o module jepmcio220 nib
yaskawa jamsc-b1051b b1051bv input module nib
yaskawa electric japmc-mc2310 nsfp japmcmc2310
yaskawa electric jamsc-c8130 uspp jamscc8130
yaskawa electric jamsc-c8120 uspp jamscc8120
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yaskawa electric jamsc-b2833 uspp jamscb2833
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yaskawa electric jamsc-b2110av uspp jamscb2110av
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yaskawa electric jamsc-b2110 uspp jamscb2110
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yaskawa electric jamsc-b1081c uspp jamscb1081c
yaskawa electric jamsc-b1075-1 uspp jamscb10751
yaskawa electric jamsc-b1075-1 nsfp jamscb10751
yaskawa electric jamsc-b1074-1 uspp jamscb10741
yaskawa electric jamsc-b1074-1 nsfp jamscb10741
yaskawa electric jamsc-b1063 uspp jamscb1063
yaskawa electric jamsc-b1051b uspp jamscb1051b
yaskawa electric jamsc-b1051b nsfp jamscb1051b
yaskawa electric jamsc-b1010 uspp jamscb1010
yaskawa electric jamsc-120nom27100 uspp jamsc120nom27100
yaskawa electric jamsc-120ddi35400 uspp jamsc120ddi35400
yaskawa electric disct-j1040 uspp disctj1040
yaskawa cimr-pcu40p7 mini drive 1hp 3ph 0-460v 0-400hz.
yaskawa 87820-50002 plc module 8782050002 nib
yaskawa 87820-40200 plc module 8782040200 nib
yaskawa 87820-40051 plc module 8782040051 nib
yaskawa 87820-40003 plc module 8782040003 nib
yaskawa 87820-15003-s202 plc module 8782015003 nib
yaskawa 87820-03200 plc module 8782003200 nib
yaskawa 87350-24004-s011 plc module 8735024004 xlnt
yaskawa 87350-23001 plc module 8735023001 xlnt
yaskawa 87350-12111-s206 plc module 8735012111 xlnt
yaskawa 87350-11000 plc module 8735011000 xlnt
yaskawa 87350-11000 plc module 8735011000 nib
yamato ev211f-r6 i/o board
yamatake distributed i/o module hd-clam00 hd-clabs00
yamatake distributed i/o module hd-caom00 hd-caobs00
yamatake distributed i/o module cram00hd-cram00 hd-crabs00
yamaha o2r96 vcm digital mixer
yamaha motif-rack xs motifrack xs sound module
yamaha motif xf8 workstation synthesizer keyboard
yamaha motif xf8 synthesizer
yamaha motif rack es rack sound module
yamaha motif rack es
yamaha m7cl-48es digital mixer
yamaha m7cl-48es sb168-es mixer snake package
yamaha dtx530k 5-piece electronic drum set with complete rack system
yaesu ft-736r vhf uhf 6 2 220 430 mhz ssb cw fm radio satellite transceiver
xyratex ss-1202-fc 12 36gb 1gb/s fc-al jbod
xyratex sr-1201-myff 12 18gb fc-al to fc-al raid
xyratex rs-1603 16-bay sas/sata ebod 3u storage array rs-1603-e3-ebd 16x 500gb
xyratex rs-1603 16-bay sas/sata ebod 3u storage array rs-1603-e3-ebd
xycom xvme-660 vme bus xvme 660 xvme660 intel
xycom xvme-560 analog input 70560-001 vme board
xycom xvme-202 uspp xvme202
xycom xvme-202
xycom 70540-001 nsfp 70540001
xycom 70240-001 rev 1.1 i/o module vme board
xta-3511-ctrl-1g raid controler sun 3511 arry 370-6773
xta-3511-ctrl-1g raid controler sun 3511 arry 370-6773
xsigo vpe-mod-10ge-1p wired 10 gigabit ethernet expansion module for vp780 i/o
xsigo vpe-mod-10ge-1p wired 10 gigabit ethernet expansion module for vp780 i/o
xl2000 8051 mcu development board demo systemusb 51tracer debugger
xl2000 8051 mcu development board demo systemusb 51tracer debugger
xilinx avnet virtex-6 lx130t evaluation kit aes-v6ev-lx130t-g
xia pfcu-4 uspp pfcu4
xeon 6.4gt/s turbo8000gb hdd 24gb true 3ch ddr3 ram
xeon 6.4gt/s turbo8000gb hdd 24gb true 3ch ddr3 ram
xeon 6.4gt/s turbo6000gb hdd 24gb true 3ch ddr3 ram
xenpak-10gb-zr 10gbase-zr xenpak module for cisco
xenpak-10gb-zr 10gbase-zr xenpak module for cisco
xenpak-10gb-sr 10gbase-sr module for cisco
xenpak-10gb-lr- 10gbase-lr xenpak module for cisco
xenpak-10gb-lr- 10gbase-lr xenpak module for cisco
xenpak-10gb-er 10gbase-er xenpak module with dom support for cisco
x2-10gb-sr-ll 10gbase-sr x2 module for cisco
x2-10gb-lr 10gbase-lr x2 module for cisco
x2-10gb-lr 10gbase-lr x2 module for cisco
x2-10gb-er 10gbase-er x2 module for cisco
x2-10gb-er 10gbase-er x2 module for cisco
wtc o medweld 3005 resistance weld control
ws-x6k-s2u-msfc2 catalyst 6500 supervisor 2u 256mb supervisor 512mb msfc2
ws-x6816-gbic cisco cat 6500 16-port gige module
ws-x6816-gbic cisco cat 6500 16-port gige module
ws-x6748-ge-tx cisco express forwarding 720 interface module switch 48 ports -
ws-x6748-ge-tx cisco express forwarding 720 interface module switch 48 ports -
ws-x6748-ge-tx cisco exp. forw.720 interface module switch 48 ports ma
ws-x6748-ge-tx cisco exp. forw.720 interface module switch 48 ports ma
ws-x6724-sfp cisco gigabit interface module 6500/7600 24 ports
ws-x6708-10g-3c cisco 8-port 10 gigabit en module with dfc3c module 8 ports
ws-x6708-10g-3c cisco 8-port 10 gigabit en module with dfc3c module 8 ports
ws-x6708-10g-3c cisco 8-port 10 gigabit en module with dfc3c module 8 po
ws-x6708-10g-3c cisco 8-port 10 gigabit en module with dfc3c module 8 po
ws-x6704-10ge cisco 6500 10 gigabit en interface module 4 ports
ws-x6704-10ge cisco 6500 10 gigabit en interface module 4 ports
ws-x6704-10ge cisco 6500 10 gigabit en interface module 4 ports
ws-x6704-10ge cisco 6500 10 gigabit en interface module 4 ports
ws-x6548-ge-tx cisco switching module free 1 year
ws-x6516-ge-tx catalyst 6500 16-port gig/copper module x-bar
ws-x6502-10ge cisco 6500 10 gigabit ethernet base modul
ws-x6502-10ge cisco 6500 10 gigabit ethernet base modul
ws-x6148-ge-tx cisco classic interface module expansion module 48 ports
ws-x6148-ge-tx cisco classic interface module expansion module 48 ports
ws-x6148a-ge-tx cisco classic interface module expansion module 48 ports switch
ws-x6148a-ge-45af cisco 6500 switch module 48 ports poe 802.3af
ws-x4904-10ge cisco 4-port 10 gigabit ethernet x2 expansion module
ws-x4904-10ge cisco 4-port 10 gigabit ethernet x2 expansion module
ws-x4712-sfpe cisco catalyst 4500 e-series 12pt.-10gbe sfp module
ws-x4712-sfpe cisco catalyst 4500 e-series 12pt.-10gbe sfp module
ws-x4648-rj45v-e cisco catalyst 4500e series line card switch 48 ports
ws-x4648-rj45v-e cisco catalyst 4500e series line card switch 48 ports
ws-x4648-rj45ve cisco 48-port poe line card 48 x 10/100/1000base-t lan
ws-x4648-rj45-e cisco catalyst 4500e series line card switch 48 ports
ws-x4648-rj45-e cisco catalyst 4500e series line card switch 48 ports
ws-x4648-rj45-e catalyst 4500 e-series 48-port 10/100/1000 rj45
ws-x4648-rj45-e catalyst 4500 e-series 48-port 10/100/1000 rj45
ws-x4624-sfp-e cisco line card e-series expansion module 24 ports
ws-x4624-sfp-e catalyst 4500 e-series 24-port ge sfp
ws-x4624-sfp-e catalyst 4500 e-series 24-port ge sfp
ws-x4624-sfp-e 2yr serverpartscanada.com
ws-x45-sup6l-e cisco supervisor engine 6l-e control processor
ws-x45-sup6l-e cisco supervisor engine 6l-e control processor
ws-x45-sup6-e cisco supervisor engine 6-e control processor 1yr warran
ws-x45-sup6-e cisco supervisor engine 6-e control processor 1yr warran
ws-x45-sup6-e cisco supervisor engine 6-e control processor
ws-x4516 cisco supervisor engine v 4516 control processor
ws-x4516 cisco supervisor engine v 4516 control processor
ws-x4515 cisco catalyst 4500 supervisor iv engine w/2 ge
ws-x4448-gb-sfp cisco catalyst 4500 48-port 1000base-x
ws-x4148-rj21 catalyst 4500 10/100 module 48-ports telco 4xrj21
ws-svc-wism-1-k9 cisco wireless service module wism for up to 300 lightweight
ws-svc-ssl-1-k9 cisco ssl module for catalyst 6500
ws-svc-fwm-1-k9 cisco firewall service module security appliance
ws-svc-fwm-1-k9 cisco firewall service module security appliance
ws-svc-cmm-6t1 6-port t1 interface port adapter
ws-svc-cmm-6e1 6-port e1 interface port adapter 1yr - ask 4 qty
ws-svc-cmm-6e1 6-port e1 interface port adapter 1yr - ask 4 qty
ws-sup720-3bxl cisco supervisor engine 720-3bxl control processor
ws-sup720-3bxl cisco supervisor engine 720-3bxl control processor
ws-sup720-3bxl cisco supervisor engine 720-3bxl control processor
ws-sup720-3bxl ws-x6716-10g-3cxl ciscodeal
ws-sup720-3bxl ws-x6716-10g-3cxl ciscodeal
ws-sup720-3bxl 1 ws-x6708-10g-3c super cisco bundle
ws-sup720-3bxl 1 ws-x6708-10g-3c super cisco bundle
ws-sup720-3b cisco supervisor engine 720 with pfc3b control processor
ws-sup720-3b cisco supervisor engine 720 with pfc3b control processor
ws-sup720 cisco supervisor engine 720 control processor
ws-sup720 cisco supervisor engine 720 control processor
ws-g5487 genuine cisco 1000base-zx extended reach gbic s.mode
ws-g5486 ll gbic for cisco 1000base-lx/lh long haul s.mode or m.mode
ws-g5486 cisco 1000base-lx/lh long haul gbic singlemode or multimode
ws-f6k-pfc3b catalyst 6500 sup720 policy f. card-3b 1yr - ask 4 qty
ws-f6k-msfc2 catalyst 6000 multilayer switch feature card msfcii spare
ws-f6k-dfc3a dist fwd card-3a for 65xx 6816 modules with sup720
ws-f6k-dfc3a dist fwd card-3a for 65xx 6816 modules with sup720
ws-f6700-dfc3c cisco distributed forwarding card 3c switching accelerator
ws-f6700-dfc3c cisco distributed forwarding card 3c switching accelerator
ws-f6700-dfc3bxl cisco distributed forwarding card 3bxl switching accelerator
ws-f6700-dfc3bxl cisco distributed forwarding card 3bxl switching accelerator
ws-f6700-dfc3b cisco distributed forwarding card 3b switching accelerator
ws-ce500g-12tc cisco catalyst express 500g-12tc ethernet switch
ws-cdc-2500w catalyst 6500/7600 2500w dc power supply
ws-cdc-2500w catalyst 6500/7600 2500w dc power supply
ws-cdc-1300w catalyst 6500 1300w dc power supply
ws-c6509-e sup720-3bxl x6724-sfp x6748 6509
ws-c6509-e sup720-3bxl x6724-sfp x6748 6509
ws-c6509-e catalyst enhanced 6509 chassis 9 15ru
ws-c6509-e catalyst enhanced 6509 chassis 9 15ru
ws-c6509 cisco cat 6509 chassis 9 15ru
ws-c6506-e-fan catalyst 6506-e chassis fan tray
ws-c6506-e catalyst 6506 enhanced chassis 6 12ru
ws-c6506-e catalyst 6506 enhanced chassis 6 12ru
ws-c6506 cisco cat 6506 chassis 6 12ru w/1300w ac ps
ws-c6503-e enhanced cisco cat 6503 chassis 3 4ru
ws-c6503-e enhanced cisco cat 6503 chassis 3 4ru
ws-c6503 cisco cat 6503 chassis 3 4ru
ws-c6503 cisco cat 6503 chassis 3 4ru
ws-c4507r catalyst 4500 chassis 7-
ws-c4506-e cisco
ws-c4506-e cisco
ws-c3750g-48ts-s cisco 3750g-48ts swicth w/1 yr -wsc3750g48tss
ws-c3750g-48ts-s cisco 3750g-48ts swicth w/1 yr -wsc3750g48tss
ws-c3750g-16td-s free 1 year - catalyst 3750g switch
ws-c3750g-16td-s free 1 year - catalyst 3750g switch
ws-c3750-24p-ap50 cisco ws-c3750-24ps-s and air-wlc-4402-50 bundle
ws-c3560v2-24ts-sd free 1 year cisco 3560v2 switch
ws-c3560v2-24ts-sd free 1 year cisco 3560v2 switch
ws-c3560e-48td-sd free 1 year -3560e cisco switch
ws-c3560e-48td-sd free 1 year -3560e cisco switch
ws-c3560e-48pd-sf free 1 year cisco wsc3560e48pdsf
ws-c3560e-48pd-sf free 1 year cisco wsc3560e48pdsf
ws-c3560-48ps-s cisco 3560-48ps swicth w/1 yr -wsc356048pss fast shipp
ws-c3560-24ts-s cisco cat 3560 switch 24 10/100 2 sfp slots
ws-c3550-24pwr-smi cisco cat switch 24-10/100 inline power 2 gbic ports: smi
ws-c3550-24-dc-smi cisco 3550 switch 24-10/100 2 gbic portsdc-pwrd: smi
ws-c3550-24-dc-smi cisco 3550 switch 24-10/100 2 gbic portsdc-pwrd: smi
ws-c3550-12t cisco switch 10-10/100/1000 ports 2 gbic ports: emi
ws-c3550-12t cisco switch 10-10/100/1000 ports 2 gbic ports: emi
ws-c3550-12g cisco switch 10 gbic ports 2-10/100/1000 ports: emi
ws-c2970g-24ts-e cisco switch w/1year -wsc2970g24tse 2970g24tse
ws-c2970g-24ts-e cisco switch w/1year -wsc2970g24tse 2970g24tse
ws-c2960s-24ts-l cisco 2960s-24ts swicth w/1 yr -wsc2960s24tsl fast sh
ws-c2960s-24ts-l cisco 2960s-24ts swicth w/1 yr -wsc2960s24tsl fast sh
ws-c2960-48tc-s cisco catalyst 2960-48tc switch-1year - grade a fast shi
ws-c2960-48tc-s cisco catalyst 2960-48tc switch-1year - grade a fast shi
ws-c2960-24tc-s cisco 2960-24tc switch- w/1yr - wsc296024tcs fast
ws-c2960-24tc-s cisco 2960-24tc switch- w/1yr - wsc296024tcs fast
ws-c2960-24tc-s cisco 2960-24tc switch- w/1yr - wsc296024tcs fast
ws-c2960-24tc-s cisco 2960-24tc switch- w/1yr - wsc296024tcs fast
ws-c2960-24-s cisco catalyst 2960-24-s switch 24 ports managed
ws-c2960-24lt-l cisco catalyst 2960 switch 24 ports managed
ws-c2960-24lt-l cisco catalyst 2960 switch 24 ports managed
ws-c2955c-12 cisco catalyst 2955c-12 ethernet switch 12tx w/mm uplinks
ws-c2955c-12 cisco catalyst 2955c-12 ethernet switch 12tx w/mm uplinks
ws-c2955c-12 cisco catalyst 2955c-12 ethernet switch 12tx w/mm uplinks
ws-c2955c-12 cisco catalyst 2955c-12 ethernet switch 12tx w/mm uplinks
ws-c2950t-48-si cisco cat. switch 48 10/100 2 10/100/1000base-t uplinks std i
ws-c2950g-48-ei cisco cat. switch 2950 48 10/100 with 2 gbic slots
ws-c2950g-24-ei-dc cisco switch 24 10/100 2 gbic slots dc version
ws-c2940-8tt-s 8 10/100 ethernet ports and 1 10/100/1000 ethernet port
woodward netcon 5000 5466-315 rev c analog i/o module
woodward netcon 5000 5466-258 rev e discrete i/o module
woodward netcon 5000 5466-031 rev d i/o controller
woodward governor 5466-258 module discrete i/o nip 8097
woodhead sst-pfb-clx profibus scanner for controllogix read
woodhead sst-pfb-clx profibus scanner for allen-bradley
woodhead sst sst-pfb-slc profibus scanner for allen bradley slc500
woodhead sst sst-pfb-plc5 profibus coprocessor for allen bradley plc5
woodhead sst sst-pfb-plc5 profibus coprocessor for allen bradley plc5
woodhead sst allen bradley 5136-sd-isa dh/dh/rio isa interface card
wmd pdo phase displacement oscillator modular eurorack module
with gbics
with 3 years hp on-site . win7.webcam.dvdrw
with 3 years hp on-site . win7.webcam.dvdrw
wireless wifi 802.11 eight8 channel relay module board: web tcp/ip vb6 bcb6
wireless eight 8 channel relay module board virtual com port controlled
wiredwifiindooraudiosdremote recordiphoneipad
wipotec can-i/o-16 uspp canio16
williamson 6220lt temperature controller 115vac 65-200c
wifi h.264 sony ccd 27x ptz ip security camera wireless
wic-2a/s cisco 2-port async/sync serial wan interface card
wic-1t cisco 1-port serial wan interface card
white box robotics 914 pc-bot development platform he-robot/heathkit
whirlwind ds168t/r digital snake system16x8
whedco 78005778 uspp 78005778
westinghouse pc-1250-1042 uspp pc12501042
westinghouse nl-542 nl542 6es54648me11 analog input
westinghouse 1505d39g01w0 uspp 1505d39g01w0
weatherhawk 916 wireless weather station
we ship same ws-x45-sup7-e cisco 1yr
we ship same ws-x45-sup7-e cisco 1yr
we ship same ws-cac-6000w catalyst 6500 6000w ac power supply ..
we ship same ws-cac-4000w 4000 watt ac power supply for us cable attached
we ship same ws-cac-4000w 4000 watt ac power supply for us cable attached
we ship same ws-cac-3000w cisco cat. 6500 ser. 3000w ac power supply
we ship same ws-c3750x-48t-s cisco 3750x-48t swicth w/1 yr -
we ship same ws-c3750g-24ts-e cisco 3750g-24ts swicth 1 yr
we ship same ws-c3750g-24ts-e cisco 3750g-24ts swicth 1 yr
we ship same slm2048pt cisco 50port gigabit poe smart switch sg200-50p
we ship same slm2048pt cisco 50port gigabit poe smart switch sg200-50p
we ship same slm2024pt cisco 26port gigabit poe smart switch sg200-2
we ship same slm2024pt cisco 26port gigabit poe smart switch sg200-2
we ship same pvdm2-32 cisco 32-channel packet fax/voice dsp module
we ship same pvdm2-32 cisco 32-channel packet fax/voice dsp module
we ship same hwic-1fecisco 1-port fast ethernet high-speed wan inter
we ship same hwic-1dsu-t1 cisco interface card-
we ship same hwic-1dsu-t1 cisco interface card-
we ship same glc-sx-mm sx ge sfp lc connector sx transceiver cisco genui
we ship same f/s vic3-4fxs/did cisco 4 port voice interface card
we ship same cisco1941w-a/k9 1941 router w/ 802.11 a/b/g/n fcc comp
we ship same cisco1941w-a/k9 1941 router w/ 802.11 a/b/g/n fcc comp
we ship same cisco1941w-a/k9 1941 router w/ 802.11 a/b/g/n fcc comp
we ship same cisco1941/k9 1941 integrated services router 2ge 256f/
we ship same cisco1941/k9 1941 integrated services router 2ge 256f/
we ship same cisco ws-c4948-e catalyst 4948 48-port 1yr
we ship same cisco ws-c3750x-48pf-s swicth 1 yr 3750x-48pf
we ship same cisco ws-c3750x-24t-l swicth 1 yr 3750x-24t
we ship same cisco ws-c3750x-24s-e switch 1 yr 3750x-24s
we ship same cisco ws-c3750x-24s-e switch 1 yr 3750x-24s
we ship same cisco ws-c3750v2-48ps-s swicth 1 yr
we ship same cisco ws-c3750v2-48ps-s swicth 1 yr
we ship same cisco ws-c3750v2-24ts-e 3750v2-24ts swicth 1 yr warrant
we ship same cisco ws-c3750v2-24ts-e 3750v2-24ts swicth 1 yr warrant
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