Siemens SIMATIC FM 351 - Principle of Communication between CPU and FM 351; Overview of All Available Function Blocks

6
6-4
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
6.1.1 Principle of Communication between CPU and FM 351
We introduced you to the three-way subdivision of the function blocks for the
FM 351 in the overview to Chapter 6. In this Chapter we will show you how
the separate function blocks control the communication between the CPU
and FM 351.
First of all, we would like to briefly introduce you to all the available blocks
with their names and tasks. You will see that for your application you only
need to select blocks.
Table 6-2 Overview of All Available Function Blocks
Block
Overview of Task
Reference in
Task Name Type No.
O
verv
i
ew o
f
T
as
k
Chapter
Control
INC_MOD FC 0 Incremental operating mode; approach to positions in
incremental table and to increments 254 and 255.
6.2.1
JOG_MODE FC 10 Jogging operating mode for traversing the axis manu-
ally.
6.2.2
REF_MODE FC 11 Seek-reference-point operating mode; finding the refer-
ence point for synchronizing the axis.
6.2.3
Write
REFPT FC 1 Setting - Set reference point. 6.3.1
ACT_VAL FC 2 Setting - Set process variable. 6.3.2
SNG_FCT FC 5 Transfer separate settings. 6.3.3
SNG_COM FC 6 Call separate commands. 6.3.4
TG254 FC 12 Transfer Increment 254 for incremental mode. 6.3.5
TG253_5 FC 13 Transfer Increment 255 and associated difference values
for the incremental mode.
6.3.6
Read
DIAG_INF FC 8 Read the diagnostic data from the FM 351. 6.4.1
ACT_DAT FC 9 Read the operating and service data. 6.4.2
Introduction
Overview of the
Function Blocks
Programming the FM 351