1771-ID16
1771-ID16
MOD5/0X103-007
2711-B5A1OL1
PLC執(zhí)行程序的過程分為三個階段,即輸入采樣階段、程序執(zhí)行階段、輸出刷新階段,PLC的掃描工作過程:
聯(lián)系電話:0591-62182520 * 13696852881
聯(lián)系QQ:1273632994
公司傳真:0591-62032566
公司全稱:
福州卓凱電子科技有限公司
公司地址:
福建省福州市閩侯西江濱大道77號正榮潤園1號樓1205室
(1)輸入采樣階段。在這一階段中,PLC以掃描方式讀入所有輸入端子上的輸入信號,并將各輸入狀態(tài)存入對應(yīng)的輸入映像寄存器中。此時,輸入映像寄存器被刷斷。在程序執(zhí)行階段和輸出刷新階段中,輸入映像存儲器與外界隔離,其內(nèi)容保持不變,直至下一個掃描周期的輸入掃描階段,才被重新讀入的輸入信號刷新??梢?,PLC在執(zhí)行程序和處理數(shù)據(jù)時,不直接使用現(xiàn)場當(dāng)時的輸入信號,而使用本次采樣時輸入到映像區(qū)中的數(shù)據(jù)。一般來說,輸入信號的寬度要大于一個掃描周期,否則可能造成信號的丟失。
(2)程序執(zhí)行階段。在執(zhí)行用戶程序過程中,PLC按照梯形圖程序掃描原則,一般來說,PLC按從左至右、從上到下的步驟逐個執(zhí)行程序。但遇到程序跳轉(zhuǎn)指令,則根據(jù)跳轉(zhuǎn)條件是否滿足來決定程序跳轉(zhuǎn)地址。程序執(zhí)行過程中,當(dāng)指令中涉及輸入、輸出狀態(tài)時,PLC就從輸入映像寄存器中“讀入”對應(yīng)輸入端子狀態(tài),從輸出映像寄存器“讀入”對應(yīng)元件(“軟繼電器”)的當(dāng)前狀態(tài)。然后進行相應(yīng)的運算,運算結(jié)果再存入輸出映像寄存器中。對輸出映像寄存器來說,每一個元件(“軟繼電器”)的狀態(tài)會隨著程序執(zhí)行過程而變化。
(3)輸出刷新階段。程序執(zhí)行階段的運算結(jié)果被存入輸出映像區(qū),而不送到輸出端口上。在輸出刷新階段,PLC將輸出映像區(qū)中的輸出變量送入輸出鎖存器,然后由鎖存器通過輸出模塊產(chǎn)生本周期的控制輸出。如果內(nèi)部輸出繼電器的狀態(tài)為“1”,則輸出繼電器觸點閉合,經(jīng)過輸出端子驅(qū)動外部負(fù)載。全部輸出設(shè)備的狀態(tài)要保持一個掃描周期。
Allen-Bradley 5130-RM Resource Manager Host BoardTU783 Driver board SEW 8223076.1B
ALLEN-BRADLEY 1746-OX8 SER A OUTPUT MODULE SLC500
GE Fanuc IC610MDL101B 24VDC Input Module **XLNT**
ALLEN-BRADLEY 1771 IBD/B INPUT 10 30VDL MODULE ELECTRICIAN CIRCUIT BOARD
ALLEN-BRADLEY DRIVE ACCESSORY BULLENTIN 1361 CAT#1361-AX
ALLEN-BRADLEY 1775-A1 PLC3 PROGRAMMABLE CONTROLLER W/ 1775-L3 MODULE & OTHER VAR
ALLEN BRADLEY 1326AB-A3E-11 SERVO MOTOR 122245
ABB NRDI01 TERMINATION INPUT MODULE, 9903080000
GE FANUC IC600YB915C AXIS MODULE **
GE FANUC IC600YB945D ascii /BASIC 20K CONTROL BOARD
ABB Pressductor Millmate Tensiometer PFBK-163 Board, PFBA162 38SE00466R1. NOS
GE Fanuc IC600LX612K Memory Module
GE FANUC PCB CIRCUIT BOARD MODEL A20B-0008-0030/04C
Allen Bradley - 2098-DSD-HV050-SE - High Voltage Drive
ABB ASEA CIRCUIT BOARD CARD YYT 102D (C49)
ABB ACS143-4K1-1 3hp 230V 3ph AC Drive CompAC ! !
Allen-Bradley, Interface Circuit Board 42336-172, REV.01,
ALLEN-BRADLEY 135007 PRECHARGE BOARD
Allen Bradley 1333-CAB variable Frequency AC Drive vfd variable speed 460v 5hp B
ALLEN-BRADLEY INPUT MODULE 1771-IAD SER C
ALLEN-BRADLEY PROCESSOR MODULE MINI-PLC-2/02 1.25AMP 5VDC 1772LZ
Allen-Bradley 1336E-BRF10-AA-EN-HA2-L7E Ser.D AC Drive with Manual *
Allen Bradley 22B-D010N104 AC Drive PowerFlex 40 22BD010N104 ASFA8K005408 -
3HAC15879-2 ABB Robot Servo Motor Axis 1 for IRB6600. !!
Allen-Bradley 1785-ENET /B PLC-5 EtherNet Interface Module F/W Rev B Qty
Allen-Bradley 1746-HSTP1/E PLC SLC 500 Stepper Control Module Rev A02 !
GE Fanuc IC693CMM301F Genius Communication Module
ABB IRB1400 & IRB2400 Signal Lamp Kit - Large Style Motor ON Safety Beacon
ALLEN BRADLEY 1336 AC DRIVE 120659 DRIVE BOARD 120663 DISPLAY 120673 INTERFACE
ALLEN-BRADLEY 1336 DRIVE 1336-B003-EAD-FA2-L3-S1
Allen-Bradley input module 1734-IA2 -SER B
GE Fanuc Relay Output Module - IC610MDL182A - 16 Circuits -
Allen Bradley 20BC105A0AYNANC0 /B PowerFlex 700 AC Drive 400V 105A 75HP Qty
LOT OF 3 ALLEN-BRADLEY IA Control AB AIO2101-00 Boards FOR PARTS RECTIFIER BOARD
Allen-Bradley Compact I/O 1769-AI16 AC Input 115 VAC 16pnt input module
ABB Bailey IMASM03 Analog Input Slav Module Infi 90
GE FANUC IC600BF900L I/O TRANSMITTER PCB CIRCUIT BOARD MODULE D522771
ALLEN-BRADLEY 1756-0A16I CONTROLLOGIX 16 POINT D/O PLC MODULE FW 3.003 SERIES A
GE Fanuc IC693MDL640C Input Module Series 90-30 - NOS
ABB 3HAC14526-1 Robot Controller Drive System Cable Jib
Allen-Bradley 1785-LT2 PLC-5/25 Processor Module Ser A Firm H
ALLEN-BRADLEY AC OUTPUT MODULE 1771-OAD
ALLEN BRADLEY 1.5 HP AC VFD DRIVE W/KEYPAD 380/460 VAC 1336S-BRF15-AN-EN
ALLEN-BRADLEY ControlLogix ETHERNET MODULE 1756-ENET/B F/W 2.6
Allen-Bradley 1756-IB16I (1756IB16I) DC Isol Inp Module for Controllogix F/W 2.1
ABB type B63 motor starter and auxiliary contact block type B63-30-22
PARAMETRICS 600238,600278 ABB DRIVER MODULE BOARD 7-1/2HP,YF
ALLEN BRADLEY 1336F-CWF30-AA-EN-HAS2-LS PULSE DRIVE $99
! ABB PC BOARD 3HNA005879-001





簡繁切換