Selecting the Overflow Control Function
Original instructions
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At a Glance
Overflow Control is defined by a monitored or unmonitored lower threshold, and by a monitored or unmonitored upper threshold.
Procedure
The procedure for modifying the Overflow Control parameters assigned to an analog module channel is as follows.
Step
Action
1
Access the hardware configuration screen for the appropriate module.
2
Click in the cell of the Scale column for the channel you wish to configure.
Result: an arrow appears.
3
Click on the arrow in the cell of the Scale column for the channel you wish to configure.
Results : The Channel Parameters dialog box appears.
4
Check the Checked box of the Underflow field to specify an underflow threshold.
5
Check the Checked box of the Overflow field to specify an overflow threshold.
6
Confirm your changes by closing the dialog box
7
Validate the change by clicking Edit → Validate.
Overflow Flags
If under/overflow control is required, indications are provided by the following bits.
Bit Name
Flag (when = 1)
%IWr.m.c.1.5
The value being read falls within the Lower Tolerance Area.
%IWr.m.c.1.6
The value being read falls within the Upper Tolerance Area.
%IWr.m.c.2.1
If over/underflow control is required, this bit indicates that the value currently read falls within one of the two unauthorized ranges:
  • %MWr.m.c.3.6 denotes an underflow
  • %MWr.m.c.3.7 denotes an overflow
%Ir.m.c.ERR
Channel Error.