ABB AC 31 User Manual

Program Optimization
ABB Control - AC 31 Page 6-5
1SBC 260400 R1001-b 06.99
1.3. Passing parameters
The following syntax is used when parameters are to be exchanged between a sub-program
and a program:
- Values -> parameters
- The sub-program call
- Parameters -> result
In the example below:
SUB1
EN
VALID1
SUB1
EN
VALID2
VAL1
VAL2
PARAMETER0
RESULT1
RESULT2
PARAMETER1
PARAMETER0
PARAMETER1
VAL1 and VAL2 should be transmitted to the SUB1 sub-program and the results RESULT1
and RESULT2 received. VAL1 and VAL2 are transferred to the variable PARAMETER0 for
processing in the sub-program. The result of this process, PARAMETER1, is transferred to the
variables RESULT1 and RESULT2 for use later in the program.
1.4. Limits
A sub-program may not be called from a sub-program.
The total number of historical values in a sub-program is limited to 128. The timer functions are
not included in this limit.
The total is obtained by multiplying the number of historical values in the sub-programs by the
number of calls.
Should this number be exceeded a class 4 code 145 error will appear and the central unit will
not be able to pass to RUN.
The maximum number of sub-programs is 12.
Should this number be exceeded a class 4 code 144 error will appear and the central unit will
not be able to pass to RUN.

ABB AC 31 Specifications

General

Brand	ABB
Model	AC 31
Category	Controller
Language	English