Micromod Micro-DCI: 53IT5100A Indicator/Totalizer - Manual (Page 25)

2.4.2.3 CONTACT INPUT TO CCI0 AND CCI1
Separate contact input signals to CCI0 and CCI1 can be used for alarm inputs. One side of each
remote contact must be connected to power common as illustrated in Figure 2-4. Minimum opened
or closed recognition time for a remote contact must be 0.05 seconds.
2.4.2.4 CURRENT OUTPUT FROM ANO0
A current output signal is available for re-transmission of one of the input signals ANI0 through
ANI3. Observe the proper polarity when connecting the output to another instrument.
2.4.2.5 CONTACT OUTPUTS CCO0 AND CCO1
Discrete contact outputs CCO0 and CCO1 are identified in Figure 2-4. Each discrete output is a
solid state switch with a rating of 30 V dc, 50 mA maximum. A CCO is referenced to power com-
mon.
When this contact is connected to an inductive load, an external arc suppression network is re-
quired for contact protection.
2.4.2.6 DATALINK CONNECTIONS
Datalink is an interrogator/responder serial interface capable of supporting 32 instruments on a sin-
gle network. It uses an RS485 physical interface. The Datalink wiring diagram for this instrument
is provided as Figure 2-5. Complete coverage of the Datalink is provided in the SUPERVISOR-PC
Instruction Bulletin 53SU5000.
2.4.3 FACTORY SET CALIBRATION
Each unit contains individual factory set entries that calibrate the four analog inputs (ANI0 through
ANI3) and analog output (ANO0). There is a calibration sheet supplied with each instrument that
should be retained for future reference when the installation is completed. Reference Section 5.3
for additional information.
2.5 GROUNDING
Installations are expected to have access to an independent, high quality, noise-free point of earth
reference. The system should be connected by a dedicated, low resistance (less than one ohm)
lead wire directly to the installation’s point of earth reference. This ground reference is referred to
as the Instrumentation Ground. If an instrumentation ground reference does not exist in the installa-
tion, an earth ground electrode should be established with an independent grounding rod or ground-
grid mesh. Grounding connections are described in Section 2.4.2.1.1 and 2.4.2.1.2.
Section 2. Installation
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