3 Safety-Related Functions
11.03
3.1 Basic mechanisms of SI functions
© Siemens AG 2003 All Rights Reserved
3-74
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
•
Alarm message:
The alarm "Defect in a monitoring channel" is displayed. An entry is made
in the following machine data to decode errors in detail.
Table 3-7
Machine data for detailed error coding, STOP F
MD number
Control
Meaning
-
840D
For the 840D system, the error code is displayed when
the alarm is output.
1395 611
digital
$MD_SAFE_STOP_F_DIAGNOSIS
Note:
The significance of the error codes can be found in
Chapter 6, "Alarms for SINUMERIK 840D under Alarm 27001 "Defect in a monitoring
channel".
•
Acknowledgement:
The saved alarm can be reset with the NC-RESET key. An unintentional
restart is prevented for STOP B/A. The fault can only be acknowledged
with a power on for the drive and control.
Example 1, delaying the transition from STOP F to STOP B:
The speed characteristic of an axis for parameterized stopping is shown in the
following diagram. In this case, the axis should continue 500 ms and then brake
along the parameterized ramp. A delay time of 2.5 s is selected until STOP B is
initiated ($MA_SAFE_STOP_SWITCH_TIME_F).
Weiterfahren (ESR)
Bremsen an Rampe
= Stillsetzen (ESR)
t1
t2
t3
v
t
Fig. 3-9
Speed characteristic of an SI axis when stopping with STOP F
The following actions take place at the individual instants in time:
t1:
STOP F occurs, ESR is started
t2:
500 ms after t1, braking starts along the parameterized
ramp
t3:
STOP B is initiated 2.5 s after t1. The axis is already stationary
at this time. This means that pulses can be immediately cancelled.
