Allen-Bradley
1756-L55
Allen-Bradley 1756-L55 Ser A ControlLogix Processor 1.5MB RS232 630mA 5.1VDC
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PLC Processors & CPUs
328 listings · 260 in stock
328 PLC processors & CPUs listings from the brands you use, each one photographed. Free shipping to all 50 US states.
Allen-Bradley
1772-LSP
Allen-Bradley 1772-LSP Mini-PLC-2/05 Processor 120VAC 5VDC 2A 3K RAM Ser A Rev H
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$34.89
Allen-Bradley
1785-L60B
Allen-Bradley 1785-L60B Ser C PLC-5/60 Processor Module 64K 5VDC 3.3A Rev H DH+
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$146.89
Rockwell Automation
1764-28BXB
Allen-Bradley 1764-28BXB Ser B MicroLogix 1500 Base Unit 24VDC 16 DC In 12 Out
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$147.89
ABB
57520001-GY
ABB 57520001-GY DSCA 180A Processor Board PR:08 Startmode Switch 2 Serial Module
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$1,014.89
Mitsubishi
Q06UDHCPU
Mitsubishi Q06UDHCPU MELSEC-Q Universal QCPU CPU Unit 60K Steps USB RS-232 PLC
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$167.89
Siemens
6ES5941-7UB11
Siemens 6ES5941-7UB11 SIMATIC S5-115U CPU 941B PLC Module E-Stand 06 15-Pin Port
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$440.89
Allen-Bradley
1761-L32AWA
Allen-Bradley 1761-L32AWA MicroLogix 1000 PLC 32 I/O 20x120VAC 100-240VAC Ser E
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$131.89
Allen-Bradley
1756-L55/A
Allen-Bradley 1756-L55/A ControlLogix Processor 750KB 208KB FW 1.4 1756-BA1 Key
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$60.89
Omron
CPM2C-32CDTM-D
Omron CPM2C-32CDTM-D PLC CPU Unit 24VDC 3W 32 I/O Transistor Sink MIL Connector
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$136.89
Allen-Bradley
1756-L55
Allen-Bradley 1756-L55 Ser A ControlLogix Logix5555 Processor 750KB Memory PLC
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$77.89
Allen-Bradley
1756-L55
Allen-Bradley 1756-L55 Ser A ControlLogix Logix5555 Processor Module 3.5 MB PLC
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$31.89
Allen-Bradley
1785-L80B
Allen-Bradley 1785-L80B PLC-5/80 Processor Module Series D 3.3A 5VDC Controller
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$254.89
Square D
8020 SCP-401
Square D SY/MAX 8020 SCP-401 PLC Processor Module Series D Rev 4.00 5VDC w/ Key
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$50.89
Allen-Bradley
1785-L60B
Allen-Bradley 1785-L60B Series C PLC-5/60 Processor Module 96363673 A01 FRN U.2
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Allen-Bradley
1785-L60B
Allen-Bradley 1785-L60B Series D PLC-5/60 Processor Module 96215474 A01 FRN B
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$78.89
Allen-Bradley
1756-L55M12
Allen-Bradley 1756-L55M12 ControlLogix Logix5555 Processor 1756-L55/A 1756-M12/A
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$219.89
Emerson
5X00241G01
Emerson Ovation 5X00241G01 Processor Module DCS Controller Westinghouse Part
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$113.89
Allen-Bradley
1747-L532
Allen-Bradley 1747-L532 Ser A SLC 5/03 CPU Processor Module 16K DH485 RS232 PLC
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$92.89
Siemens
6ES7315-2AH14-0AB0
Siemens 6ES7315-2AH14-0AB0 Simatic S7-300 CPU 315-2 DP 24VDC 256KB MPI Profibus
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$131.89
Schneider Electric
140CPU11303
Schneider Automation 140CPU11303 Quantum Processor 512K 80186 20MHz PV 03 RL 82
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$105.89
Mitsubishi
A1SHCPU
Mitsubishi A1SHCPU MELSEC AnS PLC CPU Unit 8K Steps 256 I/O 5VDC 0.3A 0.33us UL
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$103.89
Allen-Bradley
1766-L32AWA
Allen-Bradley 1766-L32AWA Ser A MicroLogix 1400 PLC 20 In 12 Relay Out 100-240V
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$244.89
Industrial part
HC500-CU-HN
Hetronik HC500-CU-HN 500.102 Heater Control CPU Module 24VDC Heatcontrol Unit
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$637.89
Get a quote on PLC Processors & CPUs
Need more units than we list, a part you don't see here, or prices for a whole list? Send us the part numbers and quantities and we reply within 1 hour during business hours (Mon to Fri 9 to 4:30 CT).
Guides for PLC Processors & CPUs
- Legacy PLCsSLC 500 End of Life: Keep Running or Migrate?Where the SLC 500 stands, which spares keep one running, and how a phased move to CompactLogix keeps downtime short.
- Parts identificationHow to Read an Allen-Bradley Catalog Number & SeriesBulletin numbers, module codes, suffixes, the series letter and firmware revision, and how each one affects whether a replacement will work.
Troubleshooting guides
- TroubleshootingAllen-Bradley PLC Battery Low: Which Battery and Safe SwapThe battery for each controller family, what the BAT or BATT LED and the T10:C10 minor fault mean, how long you have, replacing it safely, and whether the program survives.
- TroubleshootingSiemens S7-1200/S7-1500 ERROR LED & Diagnostic BufferRUN/STOP, ERROR and MAINT patterns on S7-1200 and S7-1500 CPUs, the diagnostic buffer in TIA Portal, on the S7-1500 display and in the web server, and the first checks.
- TroubleshootingPLC Won't Go to RUN? Allen-Bradley Mode and Fault ChecksKeyswitch and mode-switch positions, the faults that block RUN, firmware and project mismatches, missing or wrong I/O modules, forces, and the order to check them in.
- TroubleshootingControlLogix & CompactLogix Major Fault Codes ExplainedMajor fault types and codes (T01 power-up to T07 memory), where to read them in Studio 5000, minor vs major vs I/O faults, the first checks and clearing a fault safely.
- TroubleshootingSiemens S7-300/S7-400 SF & BF LEDs and Diagnostic BufferSF vs BF (and INTF, EXTF, BUSxF on the S7-400), steady vs flashing, reading the diagnostic buffer in STEP 7, and the first checks for modules, PROFIBUS, PROFINET and backup batteries.