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Operating manual ZX09/20/21-Series
8.2.8 Step 8: Connecting the outputs
In the next step the digital outputs can now be connected. For this, proceed as de-
scribed in chapter 5.6.1 "Connecting the digital outputs". If an output is programmed,
the output LEDs 1..4 light up according to the programming. No signal is emitted at the
digital outputs as long as U+ is not connected.
If an output of signals via the digital outputs is not planned, this step can be skipped.
8.2.9 Step 9: Connecting the power supply of the digital outputs
In the last step the power supply of the digital outputs is connected. Proceed as de-
scribed in chapter 5.6.1 "Connection of the digital outputs". Only switch on the supply
voltage after connecting it to the terminals.
9.
Diagnose
There are various LEDs on the controllers, which allow easy diagnosis and are helpful
in the event of any necessary troubleshooting. A green LED labelled RUN (ZX09
series, see Fig. 28) or a blue LED labelled Pwr (ZX20/21 series, see Fig. 29) is used to
indicate the presence of the operating voltage in addition to the power supply
connection.
The green "RUN" LED on the ZX09 series outputs flashing codes in the event of an
error. For this purpose, the start code "2 s light, 2 s dark, 2 s light" is cyclically output,
followed by a number of dark pulses corresponding to the error code:
The states of the digital outputs are indicated by the LEDs 1..4 (ZX09 series) next to
the digital outputs or by the LEDs Digital Output 01..16 (ZX20/21 series) on the top of
the controller (see Fig.28 or 29). In addition, the ZX09 series has a red LED labelled
OC next to the outputs (see Fig. 28). This indicates an "Over Current", i.e. a short
circuit at one of the digital outputs, or the absence of a power source at U+ / M.
Errors
Error code
Error at the outputs (red LED "OC" lights up additionally)
7
Error in checksum (retain variables)
5
