Siemens 6ES7 232-4HA30-0XB0 SIMATIC S7-1200, Analog Output SB 1232, 1 AO, 10VDC (12 BIT RES.) OR 0-20 MA (11 BIT RES): Amazon.com: Industrial & Scientific
Siemens TXM1.8X Universal I/O Module 8 Point Analog TX-I/O Landis & GYR: Amazon.com: Industrial & Scientific
s7-200 Analog Input and Output PLC Extension Module, Analog Module Input and Output PLC Extension Module 6ES7 235-0KD22-0XA8 EM235: Amazon.com: Tools & Home Improvement