YOKOGAWA GX20 User Manual

1-108
IM 04L51B01-01EN
Description
The internal switch or relay output is 0 when the calculated result of logic math is as follows
(or 1 otherwise).
• When the calculated result is greater than –0.5 and less than 0.5
• When the calculated result is in error
Operation Interval
Computation and updating of the output operate at the scan interval. However, if the scan
interval is less than 100 ms, it runs at 100 ms.
If the measurement mode is set to dual interval, logic math runs according to the master
scan interval.
Starting
Operation starts when the logic math setting is changed to a value other than off. It is not
affected by the starting and stopping of math, recording or control.
AbouttheLogicMathData(LM)
Logic math data is used when you want the result of a logic math operation to be reflected
in the operation of another logic math number in the same period. The function returns a
1 when the logic math operation outputs a 1 and 0 when the operation outputs a 0. The
function also returns a 0 when the output type of the specified logic math number is set to
Off.
The data cannot be used in the calculation expression of a math channel.
LM values are retained only during the same scan interval.
Operating Conditions
The relay (DO channel) values used in logic math are displayed values (values that reflect
energized or de-energized).
Logic math is applied to the internal switches and relays (DOs) after the next interval. If you
want to reflect the results of logic math within the same interval, use logic math data (LM).
Example: Differences in the logic math results depending on the calculation expression
Logic math
number
Output Calculation expression
Output type Output No. Setting 1 Setting 2
Settings LM01 Internalswitch 1 W001 W001
LM02 Internalswitch 2 S001 LM01
LM03 Internalswitch 3 S002 LM02
Results First interval Internalswitch
1
1 1
Internalswitch
2
0 1
Internalswitch
3
0 1
Second interval Internalswitch
1
1 1
Internalswitch
2
1 1
Internalswitch
3
0 1
Third interval Internalswitch
1
1 1
Internalswitch
2
1 1
Internalswitch
3
1 1
If multiple logic math operations set the same output, the result of the logic math with the
largest logic math number is reflected. However, for the logic math data (LM), the calculated
result of that number is reflected.
1.9ConfiguringLogicMath(/MToption)

YOKOGAWA GX20 Specifications

General

Brand	YOKOGAWA
Model	GX20
Category	Recording Equipment
Language	English