Yokogawa DR240 - Manual (Page 207)

12-5 IM DR231-01E
Executing Computation (Available with the /M1 Model)
12
12.2 Setting a Computation Equation
A computation equation can be set for up to 30 channels (A01 to A30).
Setting the mode
If “A01-30 MODE=ON” is specified as in the example given on the previous page, the same
equation can be set for channels A01 to A30. To set an equation for one channel only, specify,
for instance, “A01-A01 MODE=ON”.
Computation equation
In addition to operators described on page 12-1, the following symbols can be used in equations.
(/) : Used for ( ) setting.
K : Used if equations contain constants K01 to K30.
M : Used to specify the measurement channel No. for which the data saved on the RAM disk
is to be re-generated. Applicable for the DR130-1/DR231-1/DR241-1 equipped with a
floppy disk drive.
A : Used to specify the computation channel No. for which the data saved on the RAM disk is
to be re-generated. Applicable for the DR130-1/DR231-1/DR241-1 equipped with a
floppy disk drive. Also used to specify a computation-channel number, as in "A05."
C : Used to specify communication input data (digital data).
G : Used to specify the group No. for which CLOG (computation of data of a group measured
on the same time) is to be used.
Restrictions in Equations
Computation channel No
• The specified computation equation for a computation channel No. can contain only
computation channel Nos. as variable which are equal to or smaller than said computation
channel No.
(Example) A02=001+A01
In this example, any computation channel No. which is equal to or greater than A03 cannot be
used.
• Either TLOG or CLOG can be used in an equation.
Note
• Each equation must consist of up to 40 characters.
• The total number of channels and constants to be used for each equation is 16 or smaller.
Setting the recording span
Set the recording span for computation results. The setting range is from -9999999 to 99999999.
A decimal point can be placed in such positions as shown in "$.$$$$," "$$.$$$," $$$.$$,"
"$$$$.$," and "$$$$$.". The unit specified in 6.1, “Setting Recording Mode/Engineering Unit/
Recording Channel and Recording Interval” (page 6-1) will be used.
LEFT
: Sets the left-limit value of the recording span.
RIGHT : Sets the right-limit value of the recording span.
Note
If the computation ON/OFF, computation equation or span setting is changed, the alarm and partial
compression recording settings for the corresponding channel will be reset.