ADLINK LPCIe-7250 Digital I/O 8-CH Relay Outputs & 8-CH Isolated DI Card

ADLINK ND-6052 8 Channel Digital Input Module 10-30VDC, 1.2kOhms Limit

16-Channel Digital Input Isolated Module with RS-485 and Nixietube 3-Ch 30KHz

Allen-Bradley 1794-IA8I Flex I/O Isolated Input Module With Terminal Base

Acces I/O Products USB-IIRO-8 I/O Module, 8 Isolated Input, 8 Relay Out, USB-B

Allen Bradley 1771-OD /C PLC-5 6-Ch Isolated 120V AC Digital Output Module

Advantech ADAM-6050 18-Ch Isolated Digital I/O Modbus TCP Module

NUDAM ND-6013 REMOTE I/O MODULE