SIMATIC S7-1200, ANALOG I/O
SM 1234, 4 AI / 2 AO,
+/-10V, 14 BIT RESOLUTION,
OR 0-20 MA, 13 BIT RESOLUTION,
6ES7234-4HE30...

SIMATIC S7-1200, DIGITAL I/O
SB 1223, 2 DI / 2 DO,
2 DI 24V DC/2 DO 24V DC
6ES7223-0BD30-0XB0

SIMATIC S7-1200, COMMUNICATION
COMMUNICATION MODULE CM 1241,
RS485, 9 PIN SUB D (MALE),
SUPPORTS MESSAGE BASED FREEPORT
6ES7241-1CH30-0XB0