Yokogawa DR240 - Manual (Page 226)

12-6 IM DR232-01E
Example of Settings of CLOG
When computing the maximum, minimum, maximum minus minimum, sum and average of data
measured at the same time on multiple channels, you must configure groups beforehand.
Example of settings where the averages for channels 001, 002, 003, 004, 006 and 008 are
computed:
Configuration of groups:
In the SET menu, assign channels 001, 002, 003, 004, 006 and 008 to group G01, as shown
below:
SET=GROUP
GROUPNo.=G01
G01=001-004, 006, 008
Define the computational expression that computes the average of group 1, as shown below:
CALC=CLOG.AVE (G01)
Computation on Pulse Input Channels
For pulse input channels, you can define the operator TLOG.PSUM (XXXX) where the DR
recorder does not have the optional MATH function (/M1 option). The type of computation is the
integration of the count if the measurement mode is set to RATE (instantaneous count mode) or
the integration of the turn-on time if the measurement mode is set to GATE (instantaneous turn-
on time mode). In either case, the integrated value is the sum of values measured every second.
For this reason, even if you set the measurement interval to 0.5 second, the DR recorder retains
the same value for one second.
Set the maximum count and turn-on time using SPAN. The maximum configurable value is
99999999. Set the interval of summation (integration interval) as a relative or absolute time by
setting the event to TIMER with the event/action functions. Set the action to TIMER RESET.
See Section 9.1, “Setting Event/Action Functions,” (on page 9-1) for details on how to configure
the event/action functions.
If the computational expression is written as TLOG.PSUM (XXX) in the system reconfiguration
where the PULSE INPUT MODULE filed is set to “not installed,” the computational expression,
alarm settings and partial settings are initialized. In addition, if the DR recorder is not a model
with the optional MATH function (/M1 option), groups to which computation channels were
assigned by the group setting and logic boxes to which actions of the MATH function were
assigned by the logic setting are initialized.
Integration interval
Time
State of contact
ON
OFF
0
ON
You can select whether to treat a result of the computational expression TLOG.PSUM (XXXX)
exceeding 99999999 as an overflow or to continue computing with the value following 99999999
reset to 0. For details on how to make the selection, see Section 12.5, “Setting Action to Be
Carried Out in Case of Computation Error and Setting the Time Axis for TLOG SUM.” The
result of computing in this context is that resulting from a separate calculation of TLOG.PSUM
(XXXX). If you set the computational expression as TLOG.PSUM (XXXX)*100, the above
action does not take place even if the result of the calculation TLOG.PSUM (XXXX)*100
exceeds 99999999. If you have made such selection as to continue computing even if the result
exceeds 99999999, the value subsequent to 99999999 is reset to 0. If the next measured value is
4 after the result of computing has proved to be 99999999, that value is not reset to 0 but is
counted in sequence from 0 to 3, giving 3 as the result.
12.2 Setting a Computation Equation