Monitoring - Omron CQM1 Operation Manual

Monitoring

5-6 Monitoring
Measurement Mode
Comparison Mode
The input word data is used to monitor the present scaled conversion data or
comparison result. To monitor the present scaled conversion data or compari-
son result by using a ladder program, set the mode select switch on the Pro-
gramming Console to the OPERATION MODE and then retrieve the input
word data.
The input word in measurement mode will be a binary-coded scaled conver-
sion data. For example, when the factory-set scaling values are used, the
input word will be set to 270F for +9999 and D8F1 (2's complement) for
–9999.
If the scaled conversion data falls beyond the 9999 range or if the input value
falls in the overrange zone, B000 (overflow) will be set to the input word.
If the present scaled conversion data is indefinite, BBBB will be set to the
input word.
The input word has flags for comparison results, overrange detection, and
sensor disconnection detection as shown below.
Overrange
Sensor disconnection
Refer to the following table for the ON and OFF conditions of the flags for the
comparison results.
HH Scaled conversion data
value
H Scaled conversion data
value
L Scaled conversion data
value
LL Scaled conversion data
value
PASS HH, H, L, and LL set values turned
OFF
If the Unit receiving 1- to 5-V or 4- to 20-mA input detects sensor disconnec-
tion, the Sensor Disconnection Flag will be ON and all the Comparison Result
Flags will be OFF.
If input to the Unit is not within the permissible input range, the Overrange
Flag will be ON. The status of each Comparison Result Flags will remain
unchanged.
ON
HH set Scaled conversion data < HH set
value – hysteresis
H set Scaled conversion data < H set
value – hysteresis
L set Scaled conversion data > L set
value + hysteresis
LL set Scaled conversion data > LL set
value + hysteresis
HH, H, L, or LL set values turned
ON
Section 5-6
OFF
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