GE 90-30/20/Micro manual I0001 Q0001

4

Parameters:

Parameter

Description

enable

When the function is enabled, the operation is performed.

I1

I1 contains a constant or reference for the first value used in the operation.

(I1 is on the left side of the mathematical equation, as in I1 — I2).

I2

I2 contains a constant or reference for the second value used in the operation.

(I2 is on the right side of the mathematical equation, as in I1 — I2).

ok

The ok output is energized when the function is performed without overflow, unless an

invalid operation occurs.

Q

Output Q contains the result of the operation.

Valid Memory Types:

Parameter

flow

%I

%Q

%M

%T

%S

%G

%R

%AI

%AQ

const

none

enable

•

I1

o

o

o

o

o

•

•

•

•†

I2

o

o

o

o

o

•

•

•

•†

ok

•

•

Q

o

o

o

o

o

•

•

•

•Valid reference or place where power may flow through the function. o Valid reference for INT data only; not valid for DINT or REAL.

† Constants are limited to values between –32,768 and +32,767 for double precision signed integer operations.

Note

The default type is INT for 16-bit or single register operands. Press F10 to change the Types selection to DINT, 32-bit double word, or REAL (for the 350 and 360 series CPUs only). PLC INT values occupy a single 16-bit register, %R, %AI or %AQ. DINT values require two consecutive registers with the low 16 bits in the first word and the upper 16 bits with the sign in second word. REAL values, in the 350 and 360 series CPUs only—Release 9 or later, plus all releases of CPU352, also occupy a 32-bit double register with the sign in the high bit followed by the exponent and mantissa.

Example:

In the following example, whenever input %I0001 is set, the integer content of %R0002 is decremented by 1 and coil %Q0001 is turned on, provided there is no overflow in the subtraction.

		_____
%I0001				%Q0001
—— ———		SUB_———————————————————————————————————————————————————————————( )—
		INT
%R0002 —I1			Q—%R0002
+00095
CONST —I2
+00001	_____

4-28 Series 90-30/20/Micro Programmable Controllers Reference Manual–September 1998 GFK-0467K