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Introduction to STEP 5
Block Header
In contrast to other types of blocks, function blocks have other organization information in
addition to the block header.
Its memory requirements consist of the following:
•
block description as for other blocks (five words)
•
block name (five words)
•
block parameter for parameter assignment (three words per parameter).
Creating a Function Block
In contrast to other blocks, parameters can be assigned to FBs. To assign parameters, you must
program the following block parameter information:
•
Name of the block parameter (formal operands)
Each formal operand receives a name (declaration "DECL"). The name can contain up to four
characters and must begin with an alpha character. You can program up to 40 block para-
meters per function block.
•
Block Parameter Type
You can enter the following parameter types:
- I
input parameters
- Q
output parameters
- D
data
- B
blocks
- T
timers
- C
counters
Output parameters are represented to the right of the function symbol in graphics representation
(CSF). The other parameters are to the left.
•
Block Parameter Data Type
You can specify the following data types:
- BI
for operands with bit address
- BY
for operands with byte address
- W
for operands with word address
- K
for constants
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S5-115U Manual
EWA 4NEB 811 6130-02b
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