Installation
SUPREMATouch
157
US
MRD Dummy Relay
Module application/function
Up to 5 relay modules can be connected (MRO 8/MRO 16) to the MRC module. If not all 5 relay
modules are connected, an MRD module must be plugged into each of the unused relay module
connectors. The unused relays are simulated by this module.
With an MRD module connected the driver outputs of the MGO module are provided with a fixed
load. Monitoring the driver outputs therefore allows a failure state to be recognised.
All 40 outputs of the MGO modules are monitored. Output failures (open/short circuit) are identi-
fied and are reported as a system failure.
Fig. 85 View of the MRC Module
MRC
X3 -X7 = 20-pin connection for relay modules MRO 8/MRO 16
Unused relay module connections have to be fitted with MRD modules.
Module use/connection
On each MRD module one resistor is connected in series with a light-emitting diode to provide the
load for the MGO module. The light-emitting diodes show the switching state of the MGO driver
output.
LED ON = driver output conducting = relay activated
LED OFF = driver output not conducting = relay deactivated
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