Concept
RP Series Expansion Module Digital Inputs
The RP Series expansion modules have four digital inputs, which can be used for sensing of dry contact digital inputs in applications such as interfacing with light switches and window contacts.
The external connection of a digital input is shown in the following figure:
K is the monitored external switch.
V S = 5 V
R PU = 2.2 kohm
Be careful when connecting the digital inputs. When connecting the digital inputs to dry contact relays, the relays must be galvanically isolated from everything else. You can use a common wire from RET to all dry contact relays connected to the same RP Series expansion module. Do not connect RET from one RP Series expansion module to anything else, including RET/G0 of another RP Series expansion module or RP-C controller. The digital inputs may be connected to open collector outputs provided that the open collector outputs belong to circuits that are galvanically isolated from everything else.
If a RET terminal of one RP Series expansion module is connected to RET/G0 of another part of the system, it can cause problems in case there is an interruption in the G0 supply somewhere in the system. This is because the system may get its G0 connection maintained by the ground connection through the room bus (RS-485) interface, which is not designed for such a high current. This means that connection of RET of an RP Series expansion module to any part that is not galvanically isolated from everything else can damage the room bus (RS-485) interface.
RP Series Expansion Modules and Multi-sensors
Light Modules
Blind Modules
RP-C-EXT-DALI-M-PD
RP-C-EXT-0-10V-4-PD
RP-C-EXT-BL-4-HV-PD
RP-C-EXT-BL-2-LV-PD
RP-C-EXT-DALI
RP-C-EXT-0-10V-4
RP-C-EXT-BL-SMI-4-HV-PD
RP-C-EXT-BL-SMI-2-LV-PD
RP-C-EXT-REL-4
Wire Sizes and Lengths