Siemens
A5E00120081-01
Siemens A5E00120081-01 SIMATIC TP170B Main Board NEC VR4181 CPU 3x DB9 CF Slot
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$195.89
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
GE Fanuc
IC697CMM711
GE Fanuc IC697CMM711 PLC Communications Coprocessor Module 2 Port RS-232/422
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$38.89
Mitsubishi
A1SJ71QE71N3-T
Mitsubishi A1SJ71QE71N3-T MELSEC QnAS A1S Ethernet Module 10BASE-T RJ45 PLC
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$283.89
Atlas Copco
1900071062
Atlas Copco 1900071062 Elektronikon MkIV AIE-3 I/O Expansion Module 5VDC 100mA
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$1,833.89
Johnson Controls
XTM-905-5
Johnson Controls XTM-905-5 Extension Module DX9100 24VAC 50/60Hz 5VA IP20 Rev 1
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$340.89
Atlas Copco
AIE-3
Atlas Copco 8092248222 Elektronikon Mk IV AIE-3 I/O Expansion Module 5VDC 100mA
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$342.89
ABB
INNPM12
ABB INNPM12 Symphony Infi 90 Network Process Module Rev A 5VDC 10W Cl I Div 2
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$43.89
Allen-Bradley
PN-13853
Allen-Bradley PN-13853 1756-ENBT Ser A ControlLogix EtherNet/IP Bridge 10/100
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$23.89
Mitsubishi
AD75P3-S3
Mitsubishi Electric AD75P3-S3 MELSEC A-series Positioning Module RS-422 PLC
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$102.89
Turck
FDNL-S1600-T
Turck FDNL-S1600-T F0077 DeviceNet I/O Station 16 PNP Inputs 11-26V IP67 4A M12
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$19.89
Turck
FDN-DN1
Turck 6603596 FDN-DN1 DeviceNet Spanner Module 11-30VDC IP67 4/10/32/128 Bytes
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$14.89
Mitsubishi
A2ACPU
Mitsubishi A2ACPU MELSEC A-Series Programmable Controller CPU Module 25-pin Port
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$107.89
Cutler-Hammer
D100CRA20
Cutler-Hammer D100CRA20 Ser. A1 PLC Controller 20 I/O 115/230V 12x115VAC 8 Relay
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$165.89
Allen-Bradley
1768-EWEB
Allen-Bradley 1768-EWEB Ser A CompactLogix EtherNet/IP Web Server 834mA 5.2VDC
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$117.89
ABB
3HNE00009-1
ABB 3HNE00009-1 DSQC 352A Profibus DP Communication Board DB9 Robot Controller
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$94.89
Reliance Electric
57C404C
Reliance Electric 57C404C AutoMax Communications Module Rev 02 9-Pin Network DCS
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$34.89
Interlink BT
FDN-DN1
Interlink BT FDN-DN1 DeviceNet Spanner Module 11-30VDC IP67 PLC Bridge 128 Bytes
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$50.89
Mitsubishi
A1SJ71UC24-R2
Mitsubishi A1SJ71UC24-R2 MELSEC A1S Computer Link Module RS-232C DB9 19200 bps
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$48.89
Allen-Bradley
1756-DNB/A
Allen-Bradley 1756-DNB Ser A ControlLogix DeviceNet Module 24VDC 90mA 600mA@5.1V
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$30.89
Foxboro
P0926GG
Foxboro FBM224 P0926GG I/A Series 4 Channel Isolated RS-232/422/485 Comm Module
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$3,227.89
Marel
RS232
Marel MWS 3 Weighing Controller Module 3 Channel CAN Ethernet RS232 24V DIN Rail
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$730.89
ProSoft
MVI56-GSC
ProSoft Technology MVI56-GSC ASCII Comm Module ControlLogix 5.1VDC 800mA 2 Port
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$120.89
Industrial part
IC200DBI001
IC200DBI001 Rev CA VersaMax DeviceNet Network Interface Unit Class 1 Div 2 T4A
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$268.89
Allen-Bradley
20-COMM-C
Allen-Bradley 20-COMM-C ControlNet Communication Adapter Card Ser B 5VDC 275mA
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$34.89
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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.