5W 24V wireless DTU PLC wireless link modules from Lensen--Wireless Communication on Tindie
Amazon.com: PLC Controller 12/24VDC 4 Circuits Programmable Advanced Time Control w Software & USB Interface, 8 inputs for Command or Override UL : Tools & Home Improvement
Oumefar DC 24V PLC Regulator FX1N-20MR Industrial Control Board Programmable Logic Controller Motor Controller 9600 Baud Rate - Amazon.com
SIMATIC S7-200 S7-222 PLC CPU 222 DC 24V DC Output 6ES72121AB230XB0 - PLCs Kit
Amazon.com: DC 24V PLC Control Programmable Logic Controller FX1N-24MR Industrial Control Board 14 Input 10 Output 24V 5A PLC Transistor Output : Industrial & Scientific