Horner
HE693DAC420F
Horner HE693DAC420F Isolated Analog Output Module 4-Channel 4-20mA GE 90-30 PLC
Only 1 left
Free shippingShips today by 3 PM CT
$465.89
PLC I/O Modules
710 listings · 584 in stock
710 PLC I/O modules listings from the brands you use, each one photographed. Free shipping to all 50 US states.
Allen-Bradley
1734-EP24DC
Allen-Bradley 1734-EP24DC Ser B Point I/O Expansion Power Supply 24V w/ 1734-RTB
Only 3 left
Free shippingShips today by 3 PM CT
$33.89
Numatics
240-211
Numatics 240-211 G3 Series Digital I/O Module 8DI/8DO PNP 24 VDC M12 5-Pin IP65
Only 1 left
Free shippingShips today by 3 PM CT
$118.89
Modicon
B224
Modicon B224 24 VDC 16 Point True High Output Module PLC Automation Industrial
Only 3 left
Free shippingShips today by 3 PM CT
$43.89
Allen-Bradley
1734-TOPS
Allen-Bradley 1734-TOPS Ser. A POINT I/O Terminal Base 8 Spring Clamp 28-14 AWG
Only 1 left
Free shippingShips today by 3 PM CT
$17.89
Allen-Bradley
2706-NG1
Allen-Bradley 2706-NG1 Ser. C 120VAC Input Module Dataliner Message Display 5VDC
Only 1 left
Free shippingShips today by 3 PM CT
$29.89
B&R
7DI135.7
B&R 7DI135.7 Digital Input Module 4 Inputs 24VDC 8mA 50kHz System 2003 Screw-in
Only 1 left
Free shippingShips today by 3 PM CT
$273.89
B&R
X20DO9322
B&R X20DO9322 Digital Output Module 12 Channel 24 VDC 0.5A Rev.10 X20 ATEX PLC
Only 1 left
Free shippingShips today by 3 PM CT
$17.89
Allen-Bradley
1734-RTB
Allen-Bradley 1734-RTB Ser A Rev A01 POINT I/O Removable Terminal Block 8 Screw
Only 3 left
Free shippingShips today by 3 PM CT
$17.89
DGH
D3251
DGH D3251 Analog Output Module 0-20 mA RS-232C 3 Digital Inputs 10-30 VDC 12-bit
Only 2 left
Free shippingShips today by 3 PM CT
$73.89
Control Technology Corporation
12-Bit
Control Technology Corporation 2209 8-Channel Analog Output Module 12-Bit 0-10V
Only 1 left
Free shippingShips today by 3 PM CT
$419.89
Allen-Bradley
1769-OF8V
Allen-Bradley 1769-OF8V Ser A Analog Output Module 8 Ch +/-10VDC 0-10VDC 0-5VDC
Only 1 left
Free shippingShips today by 3 PM CT
$229.89
Allen-Bradley
1794-TB3
Allen-Bradley 1794-TB3 Ser A FLEX I/O Terminal Base 120VAC 10A 5VDC 640mA Screw
Only 5 left
Free shippingShips today by 3 PM CT
$38.89
Allen-Bradley
1734D-IA16
Allen-Bradley 1734D-IA16 Point Block DeviceNet 16 Point Input Module 120VAC PLC
Only 1 left
Free shippingShips today by 3 PM CT
$37.89
Modicon
AS-B882-239
Modicon AEG AS-B882-239 High Speed Counter Module 2 Point 984 Series PLC Input
Only 2 left
Free shippingShips today by 3 PM CT
$836.89
ABB
520BOD01
ABB 520BOD01 1KGT033300R0002 Binary Output Module RTU520 Industrial Automation
Only 1 left
Free shippingShips today by 3 PM CT
$300.89
Numatics
240-211
Numatics 240-211 G3 Series I/O Module 8 In 8 Out PNP 24VDC Industrial Automation
Only 1 left
Free shippingShips today by 3 PM CT
$278.89
Allen-Bradley
1794-ASB
Allen-Bradley 1794-ASB Ser E Flex I/O RIO Remote Adapter Power Supply 24VDC 5VDC
Only 2 left
Free shippingShips today by 3 PM CT
$168.89
Allen-Bradley
1746-OB16
Allen-Bradley 1746-OB16 Ser D SLC 500 Output Module 16-Point 10-50VDC PLC Card
Only 1 left
Free shippingShips today by 3 PM CT
$53.89
Allen-Bradley
1756-OB16D/A
Allen-Bradley 1756-OB16D/A ControlLogix 16-Point DC Diagnostic Output Module 2A
Only 1 left
Free shippingShips today by 3 PM CT
$42.89
P&h
75Q263D1
P&H Harnischfeger 75Q263D1 Dual SCR Thyristor Input Module Crane Pro Parts Hoist
Only 1 left
Free shippingShips today by 3 PM CT
$267.89
Allen-Bradley
1746-OB16
Allen-Bradley 1746-OB16 Ser D SLC 500 Output Module 16-Point DC Source PLC Card
In stock
Free shippingShips today by 3 PM CT
$45.89
Phoenix Contact
2752945
Phoenix Contact IB STME 24 DIO 8/8/3-2A 2752945 Interbus I/O Module 24VDC Card
Only 1 left
Free shippingShips today by 3 PM CT
$40.89
Siemens
6ES7131-6BF01-0BA0
Siemens 6ES7131-6BF01-0BA0 SIMATIC ET 200SP Digital Input Module 8 DI 24VDC Part
Only 1 left
Free shippingShips today by 3 PM CT
$22.89
Get a quote on PLC I/O Modules
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 I/O Modules
- 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
- TroubleshootingPLC I/O Module Fault or Not Responding: First ChecksModule status LEDs on ControlLogix, SLC 500, S7-300 and S7-1500 I/O, the Logix connection codes (16#0204, keying 16#0114/0116), power, slot, keying and field wiring 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.