Part of the Helmholz decentralized fieldbus I/O system – TB20
TB20 function module counters are used to detect pulses that are faster than a controller?s cycles, i.e., signals that the controller will be unable to detect properly and that therefore need to be pre-processed.
The counter module detects the edges of 24 V signals as pulses. The impulses can be counted or converted into a frequency, rotational speed, or period. The counter module features an additional 24 V input and a 24 V output for a direct response to start pulses and to quick system state changes.
Capturing modes
- Pulse & direction
- Rotary encoder with single evaluation
- Rotary encoder with double evaluation
- Rotary encoder with quadruple evaluation
Counting methods
- Continuous counting
- Once-only counting
- Periodic counting
Measuring mode
- Frequency measurement
- Rotational speed measurement
- Period measurement
Programmable input
- PLC input
- Approval (HW gate)
- Synchronization
- Periodic synchronization
- Latch
- Latch & retrigger
- Can be inverted
Programmable output
- PLC output
- Count >= Reference value
- Count <= Reference value
- Count = Reference value
- Can apply a substitute value at STOP
- 32-bit counterUp to 500 KHz (4-fold evaluation)
- Accommodates 24 V incremental encoders and proximity sensors
- Filters: 10 kHz | 50 kHz | 100 kHz | 500 kHz
- All inputs can be inverted
- Limits for counter and measured readings
- Hysteresis for input
- Pulse duration for output
- Refresh rate / averaging time for measuring mode
- 8 bytes of input data (count and status)
- 8 bytes of output data (preset count and commands)
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