YOKOGAWA GX20 User Manual

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IM 04L51B01-01EN
Configuring the GX/GP and Viewing the Settings
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App
Index
1.8.3 WritingExpressions
Common Items
Follow the rules below when writing expressions.
• Use up to 120 characters to write expressions.
• The precedence of computing terms can be specified using parentheses.
• Specify channels in expressions using channel numbers.
Example: 0001, 0012, A001, C001, W1, Z1
• The “0” in the top digit of I/O channel numbers (0101), math channel numbers (A001),
communication channel numbers (C010), constants (K), internal switch numbers (S),
flags (F), and recording status (REC), variable constants (W), integer data (Z) can be
omitted.
Examples: 101, A1, C10, K1, S1, F1, REC1
• The data of the previous scan is used in the computation for its own channel number and
channel numbers greater than its own channel number in the expression.
• Write special computations (HOLD, RESET, and CARRY) and conditional expressions at
the beginning of expressions.
Order of Precedence in Computations
The order of precedence of computation in expressions is as follows:
Type ComputingElement
Function ABS(), SQR(), LOG(), LN(), EXP(), TLOG.MAX(), TLOG.MIN(), TLOG.
AVE(), TLOG.SUM(), TLOG.P-P(), TLOG.PSUM(), CLOG.MAX(), CLOG.
MIN(), CLOG.AVE(), CLOG.SUM(), CLOG.P-P(), BIT, INT, SIN, COS,
CLOG.PAVE, CP.O2, CP.CO2
Special computation and
conditional expression
PRE, HOLD, RESET, CARRY, [a?b:c]
Power **
Logical negation NOT
Multiplication and division *, /, MOD
Addition and subtraction +, –
Greater than and less than .GT. (or >), .LT. (or <), .GE. (or >=), .LE. (or <=)
Equal and not equal .EQ. (or =), .NE. (or <>)
Logical product AND
Logical sum and exclusive
logical sum
OR, XOR
1.8ConfiguringMathChannels(/MToption)

YOKOGAWA GX20 Specifications

General

Brand	YOKOGAWA
Model	GX20
Category	Recording Equipment
Language	English