Siemens 6ES72221BH320XB0 Module Digital Output SIMATIC S7-1200 SM 1222 16 DO 24V DC: Amazon.com: Industrial & Scientific
Siemens 3RH2140-1AB00 4 pole 10 AMP Control Relay with 4 N.O. and contacts and a 24 volt AC coil - Screw Terminals: Amazon.com: Industrial & Scientific