Supplementary Operations; Enable Operation - Siemens SIMATIC S5 Manual

STEP 5 Operations
3.2

Supplementary Operations

Supplementary operations extend the operations set. However, compared to basic operations,
which can be programmed in all blocks, supplementary operations have the following limitations:
• They can be programmed in function blocks only.
• They can be represented in STL form only.
Sections 3.2.1 through 3.2.10 describe the supplementary operations.
3.2.1 Load Operation
As with the basic load operations, the supplementary load operation copies information into the
accumulator. Table 3-10 explains the load operation. An example follows the table.
Operation Operand
L
ID
BS
3.2.2

Enable Operation

Use the enable operation (FR) to execute the following operations even without edge change:
• Start a timer
• Set a counter
• Count up and down
Table 3-11 presents the enable operation. An example follows the table.
3-42
Table 3-10. Load Operation
Load
A word from the system data is loaded into ACCUM 1 regardless of
the RLO.
Parameter
0 to 255
Meaning
EWA 4NEB 811 6149-02
Manual S5-115F