7.3 Digital inputs (D1, D2, X1…X5)
Signals for open-loop control functions (e.g. mode selector switch) can be
connected to the digital inputs. There are 2 types of digital input:
Purpose and types
• Permanently assigned digital inputs D1 and D2
• Universal inputs X1…X5, activated as digital inputs X1…X5
For each digital input, the normal position can be predefined.
Normal position
The following positions can be selected: Open / Closed (OPEN / CLSD)
Only potential-free contacts can be connected to the digital inputs.
Connection diagram
G
G
G0
X...
G0
N
3101A13
AC 24 V
M
F...
Δ
p
X... M
F...
The digital signals cannot be monitored. If an important protection function, such as
a frost protection unit, is connected to this input, we recommend that you make the
wiring in such a way that a frost alarm is also triggered if there is no signal (cable
break). Setting value ”Normal position”: Closed
Troubleshooting
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Siemens Universal Controllers RLU2… CE1P3101en
Building Technologies Inputs 29.08.2008
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