MSA SUPREMA Touch, Installation & Maintenance Instructions Manual, Page: 124 / 309

MSA AUER
MSA
Description of the System
SUPREMATouch 123
US
Relay Outputs
Up to 512 switching outputs can be controlled by the system via MGO modules (40 open collector
drivers each). These switching outputs can be used to drive relays, magnetic valves, contactors,
lamps, LEDs (24 VDC/0.3 A). If relay outputs are required, various relay modules can be used:
MRO 8 Module (Relay Output Unit: Common Alarms)
This module must be used when relays alone are required for actuating common alarms and in-
stallation is to be accomplished directly in the rack. The module can be plugged directly into the
MIB module (rear of the rack). It then makes the 8 common alarm relays available. If more relay
outputs are to be provided, then MRO 8 TS modules are to be used together with the
MRC TS module (installed on the mounting rail). Each relay has a changeover contact connected
to screw terminals.
Function of the Module
• MRO 8 module 8 common alarm relays on the rack
• MRC TS module relay connection, actuation of 5 relay modules
• MRO 8 TS module 8 relays, installed on mounting rail
• MRO 16 TS module 16 relays, redundant layout, installed on mounting rail
• MRO 8 SSR TS optional 8 solid state relays, installed on mounting rail
(for very low current switching applications)
• MRO 16 SSR TS optional 16 solid state relays, redundant layout, installed
on mounting rail (for very low current switching applica-
tions)
• The module is plugged into the rear of the rack.
• It is driven by the MGO module in the rack.
• 8 relays for giving common alarms, i.e., 1st alarm, 2nd alarm, 3rd alarm, 4th alarm, failure
horn, inhibit, power supply.
• One changeover contact, connected to screw terminals, is provided for each relay.
• Standard design:
Relay energised = no alarm. The relay is de-energised when an alarm is triggered at one
or more measuring point (normally energised).
• Custom design: (not allowed for safety relevant applications)
Relay de-energised = no alarm. The relay is energised when an alarm is triggered at one
or more measuring point (normally de-energised).
• The relays can be inhibited via the MST module (to prevent alarms).