Technical properties
The EL51xx series incremental encoder interface terminals enable incremental encoders to be connected to bus couplers or the PLC. In addition to the encoder inputs A, B and optional zero pulse C, up to two additional 24 VDC inputs are available (latch and gate/latch), which can be used for resetting, setting, blocking and storing the counter value. If the incremental encoder has a fault signal output, this can be connected to the Status Input (5 VDC).
- The following inputs are available with the respective technical characteristics:
- Encoder connection:
differential signals according to RS422 and single-ended signals from TTL encoders and Open Collector encoders are supported. - Latch input and Gate/Latch input
- Status Input
- The terminal provides a parameterizable encoder supply.
- Encoder operating voltage
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Fast digital inputs – interference from interfering devices Please note that the input wiring has very little filtering. It has been optimized for fast signal transmission from the input to the evaluation unit. In other words, rapid level changes/pulses in the µs range and/or high-frequency interference signals from devices (e.g. proportional valves, stepper motor or DC motor output stages) arrive at the evaluation unit almost unfiltered/unattenuated. These interferences can be incorrectly detected as a signal.
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