Overview
The 3RK3231-2AA10 is a Siemens 3RK32-series safety-related I/O module configured as 2/4 F-DI 2 F-DO — two fail-safe digital inputs (expandable to four) and two fail-safe digital outputs, rated for 1.2 A switching current per output channel. It mounts on DIN rail, terminates via spring-loaded terminals, and carries an IP20 enclosure rating for in-cabinet installation. The module includes finger-safe touch protection.
Function & operation
This module evaluates enabling switches, selector switches, protective door monitors, and pressure mat monitors — the four input types listed in its evaluation feature set. The 1.2 A switching current per output channel is the maximum load the fail-safe outputs can switch; for inductive loads or long cable runs, derating applies per the thermal curve. The safety-related design is rated for SIL 3 / PL e (category 4) applications, with monitored startup and two-channel evaluation for the safety inputs. The 50 V insulation voltage defines the isolation between channels and to ground — keep field wiring within that limit.
Lifecycle & availability
RoHS compliance is documented since 01-05-12, indicating the module has been in production for over a decade. No official end-of-life notice is in the evidence; the module remains available through standard distribution channels. Confirm current lead time and minimum order on the RFQ.