User Manual

176 Rockwell Automation Publication 1756-UM540A-EN-P - May 2014
Appendix A Isolated Analog I/O Module Tag Definitions
Ch[x].RateAlarmLimit REAL Rate of change in Engineering Units/Second
If the absolute value of the change between samples
divided by the sample time exceeds this value, the
I.Ch[x].RateAlarm tag is sets.
Any positive value
0.0 = default (This value represents
no change between samples.)
Ch[x].LowSignal REAL Signal value that lets you scale signal units (V, mA) into
Engineering Units.
Corresponds to the C.Ch[x].LowEngineering tag. That is,
this tag’s value is scaled to the lowest Engineering Unit.
For more information on how Signal values correspond to
Engineering values, see page 37
Any value that is less than the
C.Ch[x].HighSignal tag value.
• Current input type: 4.0 mA =
default
• Voltage input type: -10.0V=
default
Ch[x].HighSignal REAL Signal scaling value that lets you scale signal units (V, mA)
into Engineering Units.
Corresponds to the C.Ch[x].HighEngineering tag. That is,
this tag’s value is scaled to the highest Engineering Unit.
For more information on how Signal values correspond to
Engineering values, see page 37
Any value that is greater than the
C.Ch[x].LowSignal tag value
• Current input type: 20.0 mA =
default
• Voltage input type: 10.0V=
default
Ch[x].LowEngineering REAL Low engineering scaling point
Corresponds to the C.Ch[x].LowSignal tag value.
For more information on how Signal values correspond to
Engineering values, see page 37
0.0 = default
(In voltage applications, default =
C.Ch[x].LowSignal tag value)
Ch[x].HighEngineering REAL High engineering scaling point
Corresponds to the C.Ch[x].HighSignal tag value.
For more information on how Signal values correspond to
Engineering values, see page 37
100.0 = default
(In voltage applications, default =
C.Ch[x].HighSignal tag value)
Ch[x].LLAlarmLimit REAL Low Low Process Alarm limit
Triggers the I.Ch[x].LLAlarm tag when the I.Ch[x].Data tag
value is less than this tag’s value.
0.0 = default
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 non-negative value
0.0 = default
Table 20 - 1756-IF8I Module - Configuration Tags
Tag Name Size Definition Valid Values