PLCs, Power Supplies & Others

4-Channel Relay Output for Legacy S5 Systems

The 6ES5452-8MR11 belongs to the SIMATIC S5 452 series of digital output modules. Engineers rely on this relay module to interface PLC logic with high-power field devices. Four mechanical relay contacts handle both DC and AC loads with complete galvanic isolation.

Key Technical Specifications

Relay Contact Architecture

Each output channel provides a single-pole double-throw configuration. This design exposes common, normally open, and normally closed terminals for every relay. Consequently, one module can simultaneously drive a primary load and signal a fault condition. The 6ES5452-8MR11 supports 12 field terminals total across its four channels .

Load Capacity and Isolation

The mechanical relays handle resistive loads up to 5A at 250V AC. Inductive switching requires derating to 1.5A under the same voltage. Electrical life varies by load type: AC-11 rated loads achieve 1.5 million cycles, while DC-11 switching yields 500,000 operations . Galvanic isolation separates field wiring from the S5 backplane, protecting sensitive logic circuits from voltage transients.

Power and Environment

The module draws 14 mA typical current from the CPU 9V supply. Relay coil power comes from an external 24V DC L+ line, consuming approximately 100 mA. Power dissipation remains near 2 watts. Horizontal mounting permits operation between 0°C and 60°C, though vertical installation reduces the upper limit to 40°C .

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