Activating The Machine Data - Siemens SIMATIC FM 353 Manual

7.3.1

Activating the machine data

Overview
The checkback signal PARA notifies you that a DB-MD has been retained. This
machine data is automatically activated at power-up. The module's positioning
functions are ready to operate.
If no DB-MD is present as yet on the FM 353 when the control is switched on, the
module can only communicate by way of the MPI interface. The control signals are
not processed by the FM 353. Once an error-free DB-MD has been transferred,
the machine data is automatically activated, PARA is set and the control signals
are processed.
If the FM 353 is working with activated machine data, you can transfer a new data
block or individual parameters in modified form to the module and, if the entire
DB-MD is error-free, put the new or modified data into effect by means of the "Acti-
vate machine data" function provided that an operating mode is active (parameter-
izing tool "Start-up display").
The following approaches are possible:
S If only E data has been modified in the machine data record since the last ac-
tivation, the equipment is activated with module status "Operation in progress"
= 0, without interrupting the servo cycle. "SYN" is retained.
S If K data has also been modified in the machine data record since the last ac-
tivation, activation takes place with module status "Operation in progress" = 0
by way of a cold restart of the servo, just as occurs for a power-up of the mod-
ule. The instantaneous actual position is still displayed, but encoder pulses from
incremental encoders might go unrecorded. "SYN" is reset.
S If the machine data record contains erroneous data at activation time, the func-
tion is rejected, with the "Machine data cannot be activated" error message (see
Table 11-5, Class 2, No. 21).
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Starting up
7-13