Configuration As A Control Line; Overview - Siemens FDCIO223 Technical Manual

3.4.3

Configuration as a control line

3.4.3.1

Overview

Building Technologies
Fire Safety
Current limiting
NOTICE
Short circuit on control line
Damage to input/output module due to increase in current
The external 24 V supply voltage must be monitored.

If a short circuit occurs on the control line, the 24 V supply voltage must be

disconnected.
The FDCIO223 input/output module does not contain any fuses. Therefore,

contact protection measures must be implemented by the customer.
Within the context of control, the secondary side supply voltage (24 V DC) is
applied to the relevant output via a relay. During control, there is no limiting of the
output current.
Structure and function
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2015-10-06