11.03
3 Safety-Related Functions
3.11 Encoder mounting arrangements
© Siemens AG 2003 All Rights Reserved
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
3-173
The previous history consists of the saved user agreement and the saved
standstill position (refer to "Saved user agreement" and "Saved standstill
position").
As described under "Axis safely referenced", a previous history can be used to
obtain the axis state "axis safely referenced".
The following conditions must be fulfilled:
•
The saved user agreement must be available.
•
The difference between the "reference position" (power on position with
absolute measuring systems or reference position with incremental
measuring systems) and the saved standstill position (including traversing
distance to reference point with ERN) must be within a tolerance window
specified via machine data.
Axis safely
referenced
EQN: Read absolute value from encoder
ERN: Approach reference point
Axis status
not OK
Check
Previous
history
no
Check OK
Axis
referenced
yes
User agreement
(softkey)
Internal
check of
previous
history
Axis not
referenced
JUST_01.DSF
Axis status
Axis status
Interface signal
"Reference point reaced" = "0"
SGA
"Axis safely referenced"
SBH/SG
is reliable
from this
axis status
Check of position
Interface signal
"Reference point signal" = "1"
Axis status is displayed via:
SE/SN
is reliable
from this
axis status
Fig. 3-43
Axis states during referencing
Previous history