Safe digital inputs (F-DI..)
The safe digital inputs (F-DI.) are connected at terminal X60. The following sections explain and describe the permitted connection options.
- Sensors that either switch the sensor supply F-SSx with active pulsed voltage supply through to a safe digital input (F-DIx) or block it. The time behavior of the pulsed voltage supply must not be influenced by the sensor.
- Electronic sensors or evaluation devices that automatically generate test pulses (switch-on or switch-off pulses) on the input signals, the duration of which is < 1 ms.
- Any signal sources that generate a DC input signal within the scope of the specification of F-DIx.
Note the wiring diagrams below. The range of connection variants might be limited depending on the sensor type. Note in addition the chapter Sensor and actuator requirements as well as the general installation regulations.
Possible contact bounce and interference can be filtered out by a parameterizable input filter. Contact bounces and interferences that are shorter than the set filter time are removed from the signal.
Unassigned inputs need not be wired. An open input is always read as a "0" signal. The safe state of the safe digital inputs is the output of "logical 0" on the associated process values.
The MOVISAFE® CS..A safety option evaluates the safe digital inputs as follows:
Single-channel connection type (NC contact):
Logic level input terminal F‑DI. | Process value F‑DI. |
|---|---|
0 | 0 |
1 | 1 |
Connection type two-channel equivalent (NC contact/NC contact):
Logic level input terminal F‑DI. | Logic level input terminal F‑DI. + 1 | Process value F‑DI. |
|---|---|---|
0 | 0 | 0 |
0 | 1 | 0 |
1 | 0 | 0 |
1 | 1 | 1 |
Connection type two-channel non-equivalent (NC contact/NO contact):
Logic level input terminal F‑DI. | Logic level input terminal F‑DI. + 1 | Process value F‑DI. |
|---|---|---|
0 | 0 | 0 |
0 | 1 | 0 |
1 | 0 | 1 |
1 | 1 | 0 |
With paired evaluation, 2 safe digital inputs F-DI. are combined into one input pair, which has an effect on a common process value.
The assignment is made according to the following table:
Input terminal | Input pair | Assigned process value |
|---|---|---|
F-DI0 | F-DI0/1
| F-DI0
|
F-DI1 | ||
F-DI2 | F-DI2/3
| F-DI2
|
F-DI3 |
Within the MOVISAFE® CS..A safety option, signal processing of the safe digital inputs is performed in two-channel mode. The safe digital inputs are therefore suitable for applications up to SIL 3 pursuant to EN 61508 and Performance Level e pursuant to EN ISO 13849-1. The following external sensors to be connected and their wiring must be in compliance with the required safety class.
