There are several different models catering for applications with differing levels of complexity. They include DIN-rail-mounting versions, with or without displays, and flush-mounting versions for use in cabinets or panels. Remote LCD or LED displays are available for use with “blind” versions. There are models for 12–24V DC/AC and 100–240V AC operation.
The controllers are split into “optimised” and “performance” models. The optimised controllers have 14-22 analogue and digital I/O in various combinations, and three expansion modules are available to take the maximum I/O count to 44. The performance versions have up to 27 built-in I/O and can be used with expansion modules with 14 or 27 I/O.
Communications are via Modbus SL or a LAN. Peripherals such as remote displays and thermostats can be connected via the expansion bus, while Schneider's Alitivar VSDs can be connected via the Modbus port.
The Modicon M171 portfolio includes a variety of temperature, humidity and pressure sensors, as well as electronic expansion valve drivers.
A configuration tool called SoMachine HVAC includes a program editor that can be used to create IEC 61131-3 compliant programs. The tool can also be used to configure and commission installations.