How to monitor signal status – MTS Series 793 User Manual
Page 313
Note:
A saturated signal that is not used by an active mode will not turn station power off.
Invalid Signals
Invalid signals are indicated by the status indicators. If you have an invalid active feedback, the following
message appears when you apply station power by overriding the interlock:“Cannot turn on hydraulic power
because one or more of the control channels has an INVALID active feedback.”
A signal is invalid when:
•
The expression for a calculated signal becomes invalid. For example, if a calculation results in a value
that is undefined as a real number (such as the square root of a negative number).
•
The floating point format is invalid. This can occur when you are defining signals in the CAN bus editor or
a Hybrid Simulation model.
•
The Manual Offset value for an active feedback signal exceeds +/- ½ of its current range. A Manual
Offset active feedback error typically occurs when you switch from a large control range with a large
Manual Offset to a small control range without first reducing the Manual Offset. For example: Suppose
you apply a Manual Offset of +5 mm to your Range 1 displacement signal of ±60 mm. You disable
hydraulics. You switch to Range 2 with a displacement signal of ±6 mm. You forget to change the Manual
Offset of +5 mm. The Manual Offset of +5 exceeds ½ of Range 2 (3 mm), generating an invalid active
feedback interlock.
Disabled Signals
A signal is disabled when:
•
The sensor calibration file (scf) is not available or if a different TEDS device is connected to the controller.
•
Changes are made to the hwi file (such as changing a DUC setting from AC to DC).
•
Improper linearization data was entered in the Advance Linearization calibration tab.
For more information
For more information on signal states, see:
on page 313.
How to Correct Invalid Active Feedback
on page 315.
Saturated Calculated Input Signals
on page 314.
How to Monitor Signal Status
1. During a test, use the Station Controls panel to monitor signal status indicators.
MTS Series 793 Control Software 313
Using Station Manager to Run Tests