Rockwell Automation 1756-OF8I ControlLogix Eight-channel Isolated Analog I/O Modules - Manual (Page 186)

186 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Appendix A Isolated Analog I/O Module Tag Definitions
Input Tags
The following table describes the Input tags associated with the
1756-IRT8I module.
Table 24 - 1756-IRT8I Module - Input Tags
Tag Name Size 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 has 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 Timemaster to the
module. (The Timemaster 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 Celsius.
Ch[x].Fault BOOL Quality of channel data. • 0 = Good
• 1 = Bad
Ch[x].Uncertain BOOL Channel data can be imperfect. • 0 = Good
• 1 = Uncertain