Siemens SIMATIC FM 353 Manual page 20

Product Overview
Mode control
The operating mode is specified to the FM 353 by way of the user program.
The FM 353 has the following modes available:
S Jogging
S Open-loop control
S Reference point approach
S Incremental mode, relative
S MDI-Manual Data Input)
S Automatic
S Automatic single block
Determining position
The control frequency pulses emitted by the FM 353 are added internally to form a
position actual value.
Stepper motor control
The stepper motor control performs the following tasks:
S Guidance of the drive commensurate with speed during movement sequence
(e.g. adjustable acceleration and delay, start/stop operation)
S Output of step pulses in form of control frequency
S Output of a direction signal
S Accurate approach by axis into programmed target position
S Phase current control to the drive device
Digital inputs/outputs
Four digital inputs and four outputs can be used as specified by the user.
You might connect:
S Reference-point switches
S Switches for external starting
S Touch probes
S Position reached, Stop ("PEH")
S Forward/backward rotation
The switching function is assigned to a given I/O number by way of the machine
data.
1-10
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0