2.4.12 Wiring the discrete digital inputs and outputs
If more than five digital outputs are required, see Wire a ROC800 digital output (DO)
module to add the ROC800 Digital Output Module.
Wire the discrete digital inputs
DANGER
ELECTRIC SHOCK
Failure to observe this precaution will cause serious personal injury or death.
The equipment operates using mains voltage that is dangerous to life. Make sure that the
circuit breakers are set to OFF and tagged off before
WARNING
EXPLOSION HAZARD
Failure to de-energize the analyzer may cause an explosion and severly injure personnel.
Do not open the enclosure unless the area is known to be non-hazardous or unless all
devices within the enclosure have been de-energized.
To connect digital signal input lines to the GC, see Engineering drawings and do the
following:
Procedure
1. Disconnect power to the analyzer and allow the components to cool for at least five
minutes.
2. Open the electronics enclosure door and access the backplane.
3. Make the digital input wiring connections on the backplane at TB7.
Note
The discrete digital input terminals on the backplane are self-powered. Devices
connected to the digital input will be powered by the gas chromatograph's (GC's)
dedicated isolated 24 V power supply.
Note
The discrete digital input terminals are optically isolated from the GC's other
circuitry.
4. Route digital in/out (I/O) lines away from the sensitive detector lines (on the left
side of the backplane) and away from the analog inputs and outputs.
There are connections for five digital inputs on the backplane at TB7, as indicated in
the following table.
Quick Start Guide Installation and start-up
00825-0100-3770 July 2020
Rosemount 700XA 35
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