9
9-19
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
9.9 Single Setting Do Not Evaluate Enable Input
The start of an operating mode for a channel is normally only possible, if the
appropriate enable input is set:
Digital input 1I2 for Channel 1
Digital input 2I2 for Channel 2
You therefore have the possibility of preparing an operating mode for start-
ing. The actual start is then independent of the program sequence in the your
user program. You start the operating mode by applying a “1” on the enable
input.
When you switch off the evaluation of the enable input, an operating mode
starts immediately after detection of the start signal. It is then not possible to
prepare an operating mode and to start it at a defined later point in time.
The operating modes are started differently in the FM 351. You must differ-
entiate between:
Edge-controlled start signals.
Level-controlled start signals.
Table 9-9 shows you the start signals for the various operating modes:
Table 9-9 Behavior of the Start Signals during the Operating Modes
Operating Mode
Start Signal is
Level-Controlled
Start Signal is
Edge-Controlled
Jog DIR_P, DIR_M
Seek-reference-point START, DIR_P, DIR_M
Absolute increment START, DIR_P, DIR_M
Relative increment DIR_P, DIR_M
In order that an operating mode actually starts, the following requirements
must be fulfilled:
The operating mode has been prepared with a set start command using an
FC.
The enable input must be switched on.
Definition
Switching the
Evaluation Off
Start Enable in
Dependence of the
Start Signal
Requirements for
Starting an
Operating Mode
Operating Modes and Settings
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