plc.myforum.ro

maersk · Member 3 Joined: 17 Aug 2014 Posts: 891

Cam Control Unit with time-based IO
This application example shows how to realize a cam control unit with multiple cam tracks and up to 128 cams per cam track using the technology modules TM Timer DIDQ 16x24V for the ET 200MP and TM Timer DIDQ 10x24V for the ET 200SP.
https://support.industry.siemens.com/cs/document/109476953/cam-control-unit-with-time-based-io
Material is to be applied on a continuous material line by means of atomizator nozzles. The material is applied depending on the position. The spray nozzles are controlled via the functionality of an electronic cam control unit depending on the actual position of the continuous material line.
Cam Control Unit with time-based IO Cam Control Unit with time-based IO

Cam Control Unit with time-based IO Cam Control Unit with time-based IO

The technology module TM Timer DIDQ is connected to the SIMATIC CPU via an interface module by means of a isochronous PROFINET connection. The SIMATIC CPU processes the individual cam tracks of the cam control unit in the isochronous OB (e.g. OB 61 “Synchronous Cycle”). For this, it reads the position and optionally also the speed values of the material line isochronously, processes them in the function block of the individual cam tracks and outputs the trigger signals for
the actuators isochronously via the technology module TM Timer DIDQ.

The provision of the position and optionally of the speed values of the material line for the cam control unit can be realized in different ways:
Isochronous reading of the values from an external encoder which is connected to a suitable module at the SIMATIC CPU:
Technology module TM Timer DIDQ in operating mode 24 V incremental encoder with signals A and B.
Technology module TM PosInput
Technology module TM Count
Isochronous reading of an isochronous PROFINET encoder.
Direct isochronous reading from the drive, when the SIMATIC CPU simultaneously controls the material line motion.
Reading the values from the technology object which controls the material line by means of the motion functions integrated in the SIMATIC CPU.

The included application example shows the program structure of a cam control unit with two cam tracks with up to 8 cams per cam track on a SIMATIC S7-1516 CPU using the technology module TM PosInput for reading and providing the position and speed values of an SSI encoder with the SIMATIC technology object external encoder

https://support.industry.siemens.com/cs/attachments/109476953/109476953_S7-1500_TimeBasedIO-CamTrack_DOC_v10_en.pdf
https://support.industry.siemens.com/cs/attachments/109476953/109476953_CamTrack1_LIB_v10.zip
https://support.industry.siemens.com/cs/attachments/109476953/109476953_CamTrack8_LIB_v10.zip
https://support.industry.siemens.com/cs/attachments/109476953/109476953_CamTrack128_LIB_v10.zip
https://support.industry.siemens.com/cs/attachments/109476953/109476953_CamTrack8_EXAMPLE_v10.zip