Siemens SIMATIC FM 452, Руководство пользователя

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Machine Data and Cam Data
8-2
FM 452 Electronic Cam Controller
C79000-G7076-C452-04
8.1 Writing and Reading the Machine and Cam Data
This chapter is relevant if you want to write the parameters directly to the module
using instructions in the user program without using the parameter assignment
user interface.
All the machine and cam data are stored in the parameter DB. You must enter the
number of the parameter DB in the appropriate channel DB.
You can write the parameter DB while working in the parameter assignment user
interface with “Export” and read it with “Import”.
Writing and Activating Machine Data
With the machine data, you adapt the FM 452 to the axis and the encoder.
The machine data are in the parameter DB at addresses 3.1 to 104.0.
Initial Parameter Assignment
If the module does not yet contain machine data (return signal PARA = 0), follow
the steps outlined below to set initial parameters without the parameter assignment
user interface:
•
Enter the new values in the parameter DB.
•
Download the parameter DB to the CPU.
•
Set the following trigger bit in the channel DB:
– Write machine data (MDWR_EN)
•
Call the FC CAM_CTRL function in the cyclic user program.
Changing Machine Data
To change existing machine data (return signal PARA = 1) from the user program,
follow the steps below:
•
Enter the new values in the parameter DB.
•
Set the trigger bits in the channel DB:
– Write machine data (MDWR_EN)
– Activate machine data (MD_EN)
•
Call the FC CAM_CTRL function in the cyclic user program.
•
Check whether the previous cam data are compatible with the modified
machine data.
•
Always write the cam data of the set cams again whether they have been
changed or not (CAM1WR_EN...CAM8WR_EN)