Reliance Electric
57C423
Reliance Electric 57C423 Common Memory Module 128K AutoMax 57423-C J-3636 PLC
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PLCs & Automation
2,686 listings · 2,257 in stock
2,686 PLCs & Automation listings in 6 categories, from makers like Allen-Bradley, Siemens, Mitsubishi. Surplus, used and new-surplus, every item photographed. Free shipping to all 50 US states and zero lead time on everything in stock.
Categories in PLCs & Automation
Reliance Electric
57C404B
Reliance Electric 57C404B Network Communications Module 57404-2F AutoMax PLC
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Reliance Electric
61C542A
Reliance Electric 61C542A 57459-1 AutoMax 16 Channel Analog Input Module 10VDC
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Allen-Bradley
1746-A7
Allen-Bradley 1746-A7 SLC 500 7-Slot Rack Chassis Series B PLC Modular 120VAC
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Allen-Bradley
1756-TBCH
Allen-Bradley 1756-TBCH Ser A ControlLogix 36 Pin Cage Clamp Terminal Block RTB
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Reliance Electric
45C40
Reliance Electric AutoMate 45C40 Dual 115VAC/DC Input Module 802811-RB PLC
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Reliance Electric
57C380
Reliance Electric 57C380 AutoMax Passive Tap Communications Card Coaxial BNC
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Reliance Electric
802802-7RD
Reliance Electric 802802-7RD 45C1A AutoMate Digital I/O Rail 300V 10A 8 Slot PLC
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Reliance Electric
0-54200-3
Reliance Electric 0-54200-3 High Speed Driver Board 801418-7A AutoMate PLC Card
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Reliance Electric
801421-4R
Reliance Electric 801421-4R AutoMate 35 PLC Power Supply 230VAC Industrial Unit
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Fanuc
A05B-2400-C060
Fanuc A05B-2400-C060 Control Unit A16B-3200-0330 A16B-2203-0370 2-Slot Rack
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Schneider Electric
TSXDSY32T2K
Schneider TSXDSY32T2K Modicon Premium 32-Point Digital Output Module 24VDC 0.1A
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Allen-Bradley
1606-XL240EP
Allen-Bradley 1606-XL240EP Power Supply 24VDC 10A 240W DIN Rail Industrial PLC
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Schneider Electric
TSXDEY32D2K
Schneider TSXDEY32D2K Modicon Premium 32-Point Digital Input Module 24VDC Sink
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Schneider Electric
ABE7-S16E2F0
Schneider Modicon ABE7-S16E2F0 Telefast Sub-Base 16 Digital Inputs 24VDC PLC I/O
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Siemens
6ES7492-1AL00-0AA0
Siemens 6ES7492-1AL00-0AA0 SIMATIC S7-400 Front Connector Screw Terminal Block
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Siemens
6ES7421-1BL01-0AA0
Siemens 6ES7421-1BL01-0AA0 Simatic S7-400 SM 421 Digital Input Module 32 DI 24V
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Siemens
6ES7460-0AA01-0AB0
Siemens 6ES7460-0AA01-0AB0 Simatic S7-400 IM 460 Interface Connection Module PLC
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Mitsubishi
A1SX40
Mitsubishi A1SX40 MELSEC PLC Input Module 16 Point DC 12/24V Industrial Control
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Allen-Bradley
1747-L553
Allen-Bradley 1747-L553 SLC 5/05 Processor Unit CPU Ser C Rev C SLC 500 Module
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Siemens
6ES7441-2AA04-0AE0
Siemens 6ES7441-2AA04-0AE0 Simatic S7-400 CP 441-2 Communication Module PLC
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AEG
AS-BDAP-208
AEG Modicon DAP 208 AS-BDAP-208 Discrete Relay Output Module 8x24VDC 230VAC PLC
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Spectrum Controls
8000 RDI-332
Spectrum Controls 8000 RDI-332 32 Channel 120VAC/DC Digital Input Module SY/MAX
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Siemens
S5 6ES5
Siemens Simatic S5 6ES5 308-3UC11 IM308-C Interface Module PLC Automation Card
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Guides for PLCs & Automation
- 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
- 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.
- 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.
- 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.