Fc Abs_Ctrl (Fc1) - Siemens SIMATIC FM 351 Manual

Positioning module
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6.3

FC ABS_CTRL (FC1)

Tasks
Using FC ABS_CTRL, you can read the operating data of each channel of the
module, assign parameters for the channels, and control the channel during
operation using the control signals, return signals, function switches, and
write/read jobs.
Each time it is called, the function performs the following activities:
Read return signals:
FC ABS_CTRL reads all the return signals for a channel and enters them in the
channel DB. Since the control signals and jobs are only executed following this,
the return signals reflect the status of the channel before the block was called.
Job management:
FC ABS_CTRL processes the write and read jobs and transfers
data between the channel DB, parameter DB, and the module.
Write control signals:
The control signals entered in the channel DB are transferred to the module.
Call
FC ABS_CTRL must be called cyclically (for example in OB1) for each channel.
Before you call FC ABS_CTRL, enter all the data in the channel DB that are
required to execute the intended functions.
Data Blocks Used
Channel DB:
The module address and the channel number must be entered in the channel
DB. Incorrect information can lead to I/O access errors or to access to a
different module causing incompatible data.
Parameter DB:
If you want to write or read machine data using jobs, you require a parameter
DB whose number must be entered in the channel DB.
Call Parameters
Name
DB_NO
RET_VAL
FM 351 Positioning Module
C79000-G7076-C351-02
Data Type
P Type
INT
IN
INT
OUT
Programming the FM 351
Meaning
Channel DB number.
Return value
6-5

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