Bero Interface (Sw 4 And Higher) - Siemens SINUMERIK 840C Installation Instructions Manual

04.96
• For switched-off channels, the interactive message "No memory available for function"
is output for the number of "Extended overstore". Selection from PLC is rejected with the
error number 144.

12.26 BERO interface (SW 4 and higher)

BERO encoders can now be connected to the 611D and to the PCA measuring circuit. The
user can select in machine data which signal is to act as the trigger for zero mark
synchronization.
Axis:
MD 1820*, bit 2 "Ext. zero mark 1st MS"
MD 1820*, bit 4 "Ext. zero mark 2nd MS"
Spindle:
MD 522*, bit 0 "Ext. zero mark"
The actual value system is updated in response to the switching edge of the BERO signal. The
switching edge depends on the rotation of direction of the encoder:
Position direction of rotation: Positive switching edge
Negative direction of rotation: Negative switching edge
The following have been introduced to provide switching hysteresis compensation:
MD 3096* - 3124* "Zero mark compensation positive" (axis),
MD 2416* - 2433* "Zero mark compensation positive" (spindle) and
MD 3128* - 3156* "Zero mark compensation negative" (axis),
MD 2434* - 2441* "Zero mark compensation negative" (spindle).
These MD are stored in the parameter set group "Ratios", i.e. they can be set per gear speed.
They are activated only when the extended parameter set switchover function is selected.
No check is performed to ascertain whether the external hardware (BERO and cabling)
required for external zero mark hardware is present or operational (e.g. open cable).
© Siemens AG 1992 All Rights Reserved
SINUMERIK 840C (IA)
12.26 BERO interface (SW 4 and higher)
6FC5197- AA50
12 Functional Descriptions
12–269