Siemens SIMATIC S7-300 Manual page 188

Description of Functions
9.2 Operating modes
Overview
The following modes are available on the FM 354:
Selecting the
FC 2 MODE_WR is called up in order to transfer the operating mode (code),
mode
which the user program entered in the user data block, to the FM 354.
The axis is controlled by enabling and disabling appropriate control signals.
Checkback signal
When the specification is allowed, the FM 354 feeds back the specified mode
for mode
to the user program. If this checkback mode matches the specified one, the
mode is active.
Changing modes Changing modes triggers an internal stop.
If a mode change is attempted while a traversing movement is in progress,
the modes are not switched until the axis comes to a stop. The mode check-
back is performed after the movement in the old mode is completed.
This does not apply to changes between Automatic and Automatic Single-
Block mode.
9-12
Jogging (ER)
Open–loop control (STE)
Reference point approach (REF)
Incremental relative (SMR)
MDI (Manual Data Input)
Automatic (A)
Automatic single block (AE)
Code 01
Code 02
Code 03
Code 04
Code 06
Code 08
Code 09
FM 354 Servo Drive Positioning Module