User Manual

194 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-OF8I module.
Table 27 - 1756-OF8I 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 and can be drifting
away from the last known time
master.
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
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
Ch[x].LowClampAlarm BOOL Channel data value that causes the channel to clamp in
the following conditions:
• Clamping is enabled on this channel, that is, the
C.Ch[x].ClampingDisable tag value = 0
• O.Ch[x].Data tag value requested is less than the value
configured in the C.Ch[x].LowLimit tag
• 0 = Channel is not clamped
• 1 = Channel is clamped
Ch[x].HighClampAlarm BOOL Channel data value that causes the channel to clamp in
the following conditions:
• Clamping is enabled on this channel, that is, the
C.Ch[x].ClampingDisable tag value = 0
• O.Ch[x].Data tag value requested is greater than the
value configured in the C.Ch[x].HighLimit tag
• 0 = Channel is not clamped
• 1 = Channel is clamped
Ch[x].RampAlarm BOOL Indicates that the channel is currently limited to changing
at the C.Ch[x].MaxRampRate tag value or is latched.
• 0 = Channel is not limited to the
C.Ch[x].MaxRampRate tag value
or latched
• 1 = channel is limited
Ch[x].NotANumber BOOL Indicates that the last value last received for the
O.Ch[x].Data
tag was not a number.
• 0 = Last channel data received
was a number
• 1 = Last channel data received
was not a number