192 Rockwell Automation Publication 1756-UM540E-EN-P - December 2017
Appendix A Analog I/O Module Tag Definitions
Input Tags
The following table describes the Input tags associated with the
1756-IRT8I module.
Ch[x].LAlarmLimit REAL Low Process Alarm limit
Triggers the I.Ch[x].LAlarm tag when the I.Ch[x].Data tag
value is less than this tag’s value
0.0 = default
Ch[x].HAlarmLimit REAL High Process Alarm Limit
Triggers the I.Ch[x].HAlarm tag when the I.Ch[x].Data tag
value is greater than this tag’s value.
100.0 = default
Ch[x].HHAlarmLimit REAL High High Process Alarm Limit
Triggers the I.Ch[x].HHAlarm tag when the I.Ch[x].Data
tag value is greater than this tag’s value.
100.0 = default
Ch[x].AlarmDeadband REAL Deadband that keeps Process Alarms triggered as long as
the I.Ch[x].Data tag value remains within the deadband of
the Process Alarm’s value
Any positive value
0.0 = default
Table 31 - 1756-IRT8I Module - Configuration Tags (continued)
Tag Name Data Type Definition Valid Values
Table 32 - 1756-IRT8I Module - Input Tags
Tag Name Data Type Definition Valid Values
Fault DINT Standard Analog Fault mask – controller sets all 32 bits on
connection loss.
• 0000_0000= Connection is
good
• FFFF_FFFF Hex = Connection
has failed
CIPSyncValid BOOL Indicates whether the module is synchronized to a valid
CIP Sync time master on the backplane.
• 0 = CIP Sync is not available
• 1 = CIP Sync is available
CIPSyncTimeout BOOL Indicates whether a valid time master on the backplane
has timed out.
• 0 = A valid time master has not
timed out.
• 1 = A valid time master was
detected on the backplane, but
the time master has timed out.
The module is currently using its
local clock with old synchronized
time data.
CIPSyncOffsetJump BOOL Indicates a significant jump, that is, 1 ms or greater, in the
CST and CIP Sync times sent from the Time Master to the
module. (The Time Master sends the CST and CIP Sync
times to the module every second.)
When a significant jump occurs, this tag value becomes 1
but changes to 0 a second later unless another jump
occurred.
We recommend that you refresh the Diagnostic Assembly
to get more data on the jump if precise time tracking is
important to your application.
• 0 = No significant jump occurred
• 1 = Significant jump occurred
CJ[0].Underrange
CJ[1]Underrange
BOOL The cold junction at channel x is below 0 °C. • 0 = Cold junction is not below
0°C
• 1 = Cold junction is below 0 °C
CJ[0].Overrange
CJ[1].Overrange
BOOL The cold junction at channel x is above 86 °C. • 0 = Cold junction is not above
86 °C
• 1 = Cold junction is above 86 °C
CJ[0].Data
CJ[1].Data
REAL The cold junction at the top module terminal, that is,
CJ[0], or the bottom module terminal, that is, CJ[1] x in °C.
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