The S7-1200 is the compact controller most machine builders reach for: CPU 1211C through 1217C, signal boards and modules for digital and analogue I/O, and CM/CP communication modules for Modbus, PROFIBUS and Ethernet. We also supply SIPLUS versions of many S7-1200 modules, rated for extended temperature and harsher atmospheres.
CPU part numbers encode the supply and I/O type — DC/DC/DC, AC/DC/RLY and DC/DC/RLY are different orderable parts.
Check whether your program needs the signal board (mounted on the CPU face) or a full signal module.
Count actual I/O against the CPU's expansion limit before adding modules.
SIPLUS variants (6AG1…) are the extended-environment equivalents of 6ES7 parts, with the same function but different ordering codes.
Frequently asked questions
What is the difference between a 6ES7 and a 6AG1 part number?
6AG1 is the SIPLUS variant — functionally the same module, but conformally coated and rated for a wider temperature range and harsher air. If your panel sits outdoors, in a cement plant or near chemicals, the SIPLUS version is worth quoting.