Mitsubishi
QX41
Mitsubushi QX41 Input Unit 24VDC 4mA
Out of stock
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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
Mitsubishi
Q02HCPU
Mitsubishi Q02HCPU CPU Unit
Out of stock
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Allen-Bradley
1756-DNB
Allen Bradley 1756-DNB SER C
Out of stock
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Allen-Bradley
1756-IB32/B
Allen Bradley 1756-IB32/B REV B02 24VDC 32 PT 10-31 2VDC 5.5mA
Out of stock
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Mitsubishi
QY41P
Mitsubishi QY41P 12/24VDC 0.1A
Out of stock
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Mitsubishi
AJ65SBT-64AD
Mitsubishi AJ65SBT-64AD 24VDC 90mA Analog Digital Converter
Out of stock
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Mitsubishi
A6TBXY36
Mitsubishi A6TBXY36 Sink I/O Terminal Board 36-Point PLC Industrial Automation
Out of stock
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Allen-Bradley
1756-ENBT
Allen Bradley 1756-ENBT SER A
Out of stock
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Allen-Bradley
1756-DNB
Allen Bradley 1756-DNB SER B PN-13849 Communication Module
Out of stock
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Allen-Bradley
1756-OB32
Allen Bradley 1756-OB32 A Control Logix 32 PT 12/24V DC D/O Module
Out of stock
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Mitsubishi
QJ61BT11N
Mitsubishi QJ61BT11N CC-Link Master Unit PLC Communication Module Industrial OEM
Out of stock
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Mitsubishi
QY42P
Mitsubishi QY42P PLC Output Module 12/24VDC 0.1A 2A Industrial Automation OEM
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Mitsubishi
QX42
Mitsubishi MELSEC-Q QX42 PLC Input Module 24VDC 4mA Industrial Automation OEM
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Allen-Bradley
1756-ENBT/A
Allen-Bradley 1756-ENBT/A ControlLogix EtherNet/IP Communication Bridge OEM
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Yasnac MRC
JZNC-MPP20E
Yasnac MRC JZNC-MPP20E Teach Pendant Motoman Robot Controller
Out of stock
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Yasnac MRC
JZNC-MPP21E
Yasnac MRC JZNC-MPP21E Teach Pendant Motoman Robot Controller
Out of stock
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Allen-Bradley
1746-A13
Allen-Bradley SLC 500 13-SLOT Rack 1746-A13 Ser.b Allen-Bradley SLC 500 1746-P2
Out of stock
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Omron
DRT2-TS04T
Omron DRT2-TS04T DeviceNet Slave 24VDC 0.07A PLC Automation OEM Module Component
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Industrial part
U10C172.00
Spectrum U10C172.00 Cable Modem Internet Gateway Ethernet OEM Networking Device
Out of stock
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Schurter
8843.8923.1
SCHURTER 8843.8923.1 IEC C14 Power Entry Module 10A 250VAC Filtered Panel Mount
Out of stock
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Verifone
MX900-02
Verifone MX900-02 USB Ethernet I/O Module w CBL-332-003 12V Power Cable POS
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Allen-Bradley
1771-IBD
Allen Bradley 1771-IBD B Rev E03 16Pt Digital Input Module 10-30VDC PLC-5 OEM
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SMC
EX600-SEN1
SMC EX600-SEN1 EtherNet/IP Fieldbus SI Unit 24VDC 10/100Mbps Industrial
Out of stock
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Siemens
6ES7 365-0BA01-0AA0
Siemens 6ES7 365-0BA01-0AA0
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.