Starting The Incremental Mode; Start Commands For The Incremental Mode - Siemens SIMATIC FM 351 Installation Manual

Operating Modes and Settings
Starting
Sequence
Start Command
9
Table 9-5
Type of Axis
Linear axis
Rotary axis
9-12
1I2; 2I2
Start, DIR_P,
DIR_M
POS
WORKING
WAIT_EN
v
v
Figure 9-3 Starting the Incremental Mode
The methods of starting an incremental mode are dependent on:
The type of incremental mode (relative or absolute).
The type of axis.
The FM 351 evaluates the rising edge of the start signal. In this respect,
please take note of Chapter 9.9.
The FM 351 starts the positioning after detecting the start command and
when all start conditions are fulfilled.
You have the following possibilities for the start:

Start Commands for the Incremental Mode

Start Command for
Relative Incremental Mode
DIR_P; Start in positive direction
DIR_M; Start in negative direction
DIR_P; Start in positive direction
DIR_M; Start in negative direction
rapid
creep
Absolute Incremental Mode
START: Start for the absolute target position.
The direction is unambiguously defined by the
target and the current actual value.
START: The target is approached along the
shortest path.
DIR_P: Start in positive direction.
DIR_M: Start in negative direction.
s
Start Command for
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02