Siemens
6ES5-955-7NC11
Siemens 6ES5-955-7NC11 Simatic S5 PS955 Power Supply Module 24V 7A 0.2A Battery
In stock
Free shippingShips today by 3 PM CT
$43.89
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
Out of stock: we can often source these. Request a quote.
Omron
CQM1-OC222
Omron CQM1-OC222 PLC Relay Output Unit 16 Point 250VAC 2A 24VDC Cl.I Div.2 T4A
Out of stock
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Foxboro
P0917YZ
Foxboro FCP270 P0917YZ Field Control Processor 24VDC 8W I/A Series Rev 0T 60C
Out of stock
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Keyence
NU-EN8N
Keyence NU-EN8N 8-Point e-CON Input Unit NPN 12-24V DC 520mA Expansion Module
Out of stock
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Foxboro
P0914YZ
Foxboro FCM2F2 P0914YZ Fieldbus Communications Module 24VDC 5.5W 2Mbps 2km Fiber
Out of stock
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Allen-Bradley
1747-L541
Allen-Bradley 1747-L541 SLC 500 5/04 CPU Processor 16K DH+ RS232 1A 5VDC Ser C
Out of stock
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Siemens
6ES7340-1AH02-0AE0
Siemens 6ES7340-1AH02-0AE0 SIMATIC S7-300 CP 340 Communication Processor RS232C
Out of stock
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Mitsubishi
A1SJ71UC24-R2
Mitsubishi A1SJ71UC24-R2 MELSEC A1S RS-232C Module 19200bps 5VDC 0.1A 32 Points
Out of stock
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Allen-Bradley
1756-ENBT
Allen-Bradley 1756-ENBT ControlLogix EtherNet/IP Module Ser A 10/100 700mA 5.1V
Out of stock
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Foxboro
FCM2F2
Foxboro FCM2F2 P0914YZ Fieldbus Communications Module 2Mbps 2km 24VDC I/A Series
Out of stock
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Foxboro
FCM2F2
Foxboro FCM2F2 P0914YZ Fieldbus Communications Module 24VDC 2Mbps Fiber 2km ST
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Allen-Bradley
1794AENT
Allen-Bradley 1794-AENT Ser B FLEX I/O EtherNet/IP Adapter Module 24VDC 440mA
Out of stock
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Mitsubishi
A1SJ71UC24-R2
Mitsubishi A1SJ71UC24-R2 MELSEC A1S RS-232C Serial Communication Module 19200bps
Out of stock
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Johnson Controls
XTM-905-5
Johnson Controls XTM-905-5 Metasys I/O Extension Module 24VAC 50/60Hz 5VA IP20
Out of stock
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Siemens
6ES7158-0AA01-0XA0
Siemens 6ES7158-0AA01-0XA0 DP/RS232C Link PROFIBUS-DP to RS-232C 24VDC Module
Out of stock
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Allen-Bradley
96347072
Allen-Bradley 96347072 1785-ENET PLC-5 Ethernet Interface Module Ser B 5VDC 1.0A
Out of stock
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Siemens
6ES5 943-7UA11
Siemens 6ES5 943-7UA11 SIMATIC S5-115U CPU 943 Module 16KB RAM 1 Programmer Port
Out of stock
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Allen-Bradley
1794-AENT
Allen-Bradley 1794-AENT Flex I/O EtherNet/IP Adapter Module 10/100 24VDC PLC
Out of stock
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Allen-Bradley
1756-ENBT
Allen-Bradley 1756-ENBT Ser A ControlLogix EtherNet/IP 10/100 Module 700mA 60C
Out of stock
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ICP CON
I-7080
ICP CON I-7080 2-Ch Counter/Frequency Input Module RS-485 DCON 10-30VDC 100kHz
Out of stock
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Foxboro
P0926GG
Foxboro FBM224 P0926GG Modbus Fieldbus Module 4-Port RS-232/422/485 24VDC Rev 0E
Out of stock
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Mitsubishi
A1SJ71AT21B
Mitsubishi A1SJ71AT21B MELSECNET/B Data Link Module MELSEC AnS 125K/250K/500K/1M
Out of stock
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Bailey
IMSED01
Bailey IMSED01 Infi 90 Sequence of Events Digital Input Module 16 Inputs 5VDC 2W
Out of stock
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Foxboro
P0914YZ
Foxboro FCM2F2 P0914YZ I/A Series Fieldbus Communications Module 2Mbps Fiber 2km
Out of stock
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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 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.