Input “Digital input”
If the encoder has an alarm or status output, in 1-channel mode this can be connected to the “Digital input” of the terminal and evaluated. The input is 5 V compatible.
The alarm or status output at the encoder is usually implemented with negative logic. This is indicated by the terminal as follows:
Encoder | ED5112 (1-channel mode) | ||
|---|---|---|---|
Alarm output | “Digital input” | LED “Ch. 1 DI” | Meaning |
HIGH level / output open | TRUE | off | e.g. encoder OK |
LOW level / PullDown - level is actively pulled down to LOW | FALSE | red | e.g. encoder malfunction |
If an overvoltage is present at the “Digital input” input, it is displayed as follows:
Fault diagnosis in case of overvoltage at the “Digital input” | Display |
|---|---|
DiagMessage, type “Error”, text ID 0x8315 | Error status input (channel n) |
0xA0n0:05 “Error input status“ | TRUE |
LED: Ch. 1 DI | red |
Notice | |
Wiring of the input “Digital input” In the terminal the input “Digital input” is internally connected to 5 V via a pull-up resistor (1 kΩ). The encoder output must actively pull the signal against GND. The resistance must be dimensioned so that it is less than 120 Ω. External power supply is not recommended. If an external supply is used, the maximum permitted voltage is 5 V against GND. |