Structure

The counter module has 24 inputs that can measure frequencies in the range of 0…20 kHz for

control circuit devices Type 3 and in the range of 0…10 kHz for proximity switches. A short-

circuit-proof supply is assigned to each input.

The 24 inputs of the counter module can either be configured for proximity switches or for

control circuit devices. Which configuration should be used is defined by plugging in the sensor

selection plug to the rear side of the connector board in use, see Chapter 4.2.2.

If proximity switches are used, the switching thresholds for open-circuits (OC) and short-circuits

(SC) are preset in accordance with EN 60947-5-6 (NAMUR). Short-circuit (SC) and open-circuit

(OC) monitoring is only allowed if the Proximity Switch setting is used.

The processor system for the I/O module controls and monitors the I/O level. The data and

states of the I/O module are made available to the processor modules via the redundant system

bus. The system bus has a redundant structure for reasons of availability. Redundancy is only

ensured if both system bus modules are inserted in the base plates and configured in SILworX.