34 2TLC172001M0211_A
6.8 Illuminated push button function
It is possible to connect both an indicator lamp and an input switch at the same time to IQ
terminals, e.g. illuminated push button. A diode must be connected locally to the input device.
The function is mainly intended for reset devices and reduces the number of IQ terminals used.
Note that the output voltage is a square wave of 24 V amplitude and the effective voltage to the
indicator is reduced to a mean value of 75%. A filament bulb or LED designed for 24 VDC can
be used.
6.9 Monitoring of muting lamp (only A20)
The system can measure the current in output IQ16 and IQ17. The function is intended for
monitoring the current in a muting lamp, but other usage is not excluded. As the hardware for
measuring the current is not fully redundant the function must be used in a dynamic way if used
for safety functions. This means that the current must be read and evaluated both when the
output is switched on and off.
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