Yokogawa Data Acquisition with PID Control CX2000 - Manual (Page 352)

14-4
IM 04L31A01-01E
PV/SP Computation Function
Equations for each PV and SP can be set.
Computation type:
General purpose computation:
Arithmetical operations (+, -, *, /),
square root, absolute value, common
logarithm, exponents, power,
relational operations (<, ≤, >, ≥, =, ≠),
and logical operators (AND, OR,
NOT, XOR).
Within group statistics: Average, max, (CLOG), min, integral
values of data within groups
Conditional expressions: [eq1?eq2: eq3]
Allowed data: Measured data, measurement computation data, internal/
external control data, communication input data, constants
(W01-W36), control input channel data, control output module/
expansion module DIO, measurement remote input, internal
switches
Constants: Up to 36 constants can be set
Error processing: OVER: Use the upper limit value of the PV range for the PV
and SP value.
UNDER: Use the lower limit value of the PV range for the PV
and SP value.
Logic Computation Function
Computation type: Relational operations (<, ≤, >, ≥, =, ≠), and logical operators
(AND, OR, NOT, XOR), and conditional expressions
[eq1?eq2:eq3].
Allowed data: Same as PV/SP computation function
Internal Switches
Allowed number:
36 (SW001-SW36)
Fixed at “nonhold.”
Analog Retransmission Function
Output format: Current output (4-20 mA, 0-20 mA, 20-4 mA, 20-0A)
Time proportional voltage pulse output, time proportional relay
output
Display/recording: Displayed as the OUT value, recorded to data file
With loops set in analog retransmission, the PID computation
is not performed.
Computation type: Same as PV/SP computation function
Allowed data: Same as PV/SP computation function
14.2 Control Function