Siemens Industry Online Support
Siemens AG
Entry type: Application example Entry ID: 109768880, Entry date: 10/22/2019

Moving PTO positioning axes of an S7-1200 as IO device centrally from an IO controller (S7-1200/S7-1500)

  • Entry
  • Associated product(s)
The "LPTO" library enables you to control up to 4 positioning axes of a S7-1200 which is assigned as an IO device to an IO controller (S7-1200 or S7-1500). IO controller and IO device communicate via I-device.

The "LPTO" library enables you to control up to 4 positioning axes of a S7-1200 as an IO device centrally from an IO controller (S7-1200 or S7-1500).
By means of a pre-configured device CPU, you can rapidly put the remote axes into operation.
In the device CPU, 4 "TO_PositioningAxis" technology objects are configured, which use the S7-1200’s 4 pulse generators to control 4 servo motors via a train of pulses, PTO (PulseTrainOut).
Using the I-device communication, you can move and monitor the remote axes from the controller.
This means that you can, for example, use 8 pulse generators (4 local and 4 remote) with an S7-1200 as an IO controller to centrally actuate 8 servo drives.

Figure 01 

Version 1.0 for STEP 7 (TIA Portal) V15.1 or higher
  Documentation (2,0 MB)
 Registrierung notwendig  Library to integrate in an existing TIA Portal project (710,4 KB)
 Registrierung notwendig  Sample project with an S7-1200 as IO controller (1,1 MB)

Further information
Function Manual "SIMATIC STEP 7 S7-1200 Motion Control V6.0 in TIA Portal V15" 
Application example "SINAMICS V: Controlled Positioning of a V90 with S7‑1200 via the Pulse/Direction Interface, with HMI (Set 7)"

Security information
In order to protect technical infrastructures, systems, machines and networks against cyber threats, it is necessary to implement – and continuously maintain – a holistic, state-of-the-art IT security concept. Siemens’ products and solutions constitute one element of such a concept. For more information about cyber security, please visit
Rate entry
no rating
Requests and feedback
What do you want to do?
Note: The feedback always relates to the current entry / product. Your message will be forwarded to our technical editors working in the Online Support. In a few days, you will receive a response if your feedback requires one. If we have no further questions, you will not hear from us.