Part of the Helmholz decentralized fieldbus I/O system – TB20
The function mode 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.
Collection Method
- Pulse & direction
- 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
Synchronization
- Off
- Only-once
- Periodic
- 32-bit counter
- Up to 4 MHz (4-fold evaluation)
- Accommodates 5 V incremental encoders (RS-422)
- Index input
- 5 V supply for sensors
- Filters: 50 kHz | 100 kHz | 500 kHz | 1 MHz
- Limits for counter and measured readings
- 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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