Adjustable interference pulse filters
Input filters are used for interference suppression at the encoder and digital inputs. The terminal offers the option to parameterize different filter frequencies according to the application.
The individual inputs are subject to the following filter frequencies:
Inputs | Max. recommended filter frequency |
|---|---|
Encoder inputs: Track A, Track B | RS422 mode: 5 MHz TTL mode: 1 MHz Open Collector: 100 kHz |
Gate/Latch input | 1 MHz |
Filter function sequence
- The filter is disabled on delivery
- The filter can be enabled via index 0x80n0:08 "Disable filter" = FALSE.
- The filter is parameterized via index 0x80n1:19 "Filter settings". The following filter frequencies are available:
Index 0x80n1:19 "Filter settings" | Default parameters for 0x80n1:1D "Counter mode" | ||
|---|---|---|---|
Setting | Meaning | Setting | Meaning |
10dec: 10 kHz | 10 kHz filter |
| |
25dec: 25 kHz | 25 kHz filter |
| |
50dec: 50 kHz | 50 kHz filter |
| |
100dec: 100 kHz | 100 kHz filter | 0x80n1:1D "Counter mode" | |
4dec | Encoder open collector | ||
5dec | Counter open collector | ||
250dec: 250 kHz | 250 kHz filter |
| |
500dec: 500 kHz | 500 kHz filter |
| |
1000dec: 1 MHz | 1 MHz filter | 0x80n1:1D "Counter mode" | |
2dec | Encoder TTL (single-ended) | ||
3dec | Counter TTL (single-ended) | ||
2500dec: 2.5 MHz | 2.5 MHz filter |
| |
5000dec: 5 MHz | 5 MHz filter | 0x80n1:1D "Counter mode" | |
0dec | Encoder RS422 (diff. input) | ||
1dec | Counter RS422 (diff. input) | ||
- If the filter is parameterized < 1 MHz, it is also active for the "Latch" and "Gate" inputs.
- If a frequency overrun is detected with the activated filter (0x80n0:08 and 0x80n1:19), a counter in index 0xA0n0:16 is incremented.
Index (hex) | Name | Description |
|---|---|---|
0xA0n0:15 | Filter violation counter input gate | Filter frequency overshoot counter for the Gate input |
0xA0n0:16 | Filter violation counter | Filter frequency overshoot counter for the encoder input signals with activated filter |
The internal error counters can be reset as follows:
- Terminal transition from "PREOP" to "OP" status
or
- Enter the following in the command object "0xFB00:01 Request"
0xFB001:01 „Request“ | Description |
|---|---|
0x9153 | Sets the internal error counter for 0xA000:15 "Filter violation counter input gate“ |
0x9154 | Sets the internal error counter for 0xA000:16 "Filter violation counter“ |
0x9163 | Sets the internal error counter for 0xA010:15 "Filter violation counter input gate“ |
0x9164 | Sets the internal error counter for 0xA010:16 "Filter violation counter“ |
Notice | |
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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