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Product overview
Introduction
In the SIMATIC and SIMOTION automation environment, control capability for both analog
and stepper motors is required for certain application cases. In addition, operational
capabilities must be implemented in the TIA world for older drives or non-Siemens drives
that have only an analog interface.
Interface module for analog drives and stepper motors
An IM 174 module (interface module) is an interface module suitable for running up to four
drives with an analog setpoint interface and with one TTL or SSI encoder per axis on the
isochronous PROFIBUS.
There is also the possibility of operating up to four stepper drives with one TTL or SSI
encoder per axis or also without encoder on the isochronous PROFIBUS.
The combination (mixed operation) of analog drives and stepper drives is also possible.
Communication between the controller and the IM 174 is performed exclusively via
PROFIBUS (a backplane connection is not possible), via an IM 174-specific message frame
type which, in addition to digital input/output data, also contains a message frame type
(standard message frame 3 and 81) for each drive specified according to a PROFIDrive
profile. As part of cyclic DP communication, the actual drive values (encoder values) are
transferred from the IM 174 module to the controller via the isochronous PROFIBUS, and the
speed setpoints calculated by the controller are transferred to the IM 174 module.
The transferred speed setpoints are then output from the IM 174 module to the drives as
analog values or pulses.
Field of application
The IM 174 can be used for the following control tasks:
A Technology CPU / SIMOTION CPU / S7 300 CPU is to be used with an isochronous
PROFIBUS
● To control analog drives
● To control stepper motors
● The encoder data is read in.
PROFIBUS module IM 174
Manual, 10/2012, A5E00859729-05
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