I/O Configuration Using the Visograph • 49
14.4.3. Digital Outputs
To configure digital outputs, press the T2 key from the I/O Con-
fig menu shown above. The DO Configuration screen is now dis-
played:
Press SET to change a DO_Config. The iPro comes defaulted
with D04=Refrigeration relay, D05=Defrost, D06=Fan and
D07=Lights. Press the T7 key to scroll to relay polarity.
Press SET to edit relay polarity and press SET again to save. The
table below outlines the relay polarity operation:
14.4.3.1. Digital Output Options
Figure 14-15 - DO Configuration
Figure 14-16 - DO Relay Polarity
Relay Polarity Logical Value Physical State of
Relay Contacts
Open TRUE Open relay
Close TRUE Closed relay
Open FALSE Closed relay
Close FALSE Open relay
Table 14-3 - Relay Polarity Operation
Digital Input Description Hardware Available
Nu Digital Onput
is not used
N/A
Light Relay for con-
trolling case/
box lights
iPro or IPX
Fan Relay for con-
trolling case/
box fans
Defrost Relay for con-
trolling case/
box defrost
heaters
Refrigeration Relay for con-
trolling case/
box LLSV
Alarm Relay for con-
trolling output
of alarm signal
Enable Auxiliary relay
that is enabled
when
controller is
enabled
Table 14-4 - Digital Outputs
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