DC 24V PLC Control Programmable Logic Controller FX1N-24MR Industrial Control Board 14 Input 10 Output 24V 5A PLC Transistor Output: Amazon.com: Industrial & Scientific
FX3U-48MT Programmable Logic Controller 24 Input 24 Output 24V 1A PLC Industrial Control Board with High Speed Counting: Amazon.com: Industrial & Scientific
Amazon.com: Programmable Logic Controller, Digital 24V PLC S7-200 CPU224XP DC/DC/DC Programmable Controller for Circuit Controlling : Industrial & Scientific
YWBL-WH DC 24V Current Signal Isolator Transmitter 4-20mA PLC Detect Signal Conditioner(One in and one Out 4-20mA Turn 0-10V): Amazon.com: Industrial & Scientific