Interface Signals - Siemens SINUMERIK 840D sl Function Manual

There are machine data fields, which are independent of one another, for these two machine
data groups, in which the checksums are saved.
These two groups are subdivided into various machine data, which in turn are used to calculate
independent checksums. Each checksum change is displayed with its own alarm message.
This means that using the alarm number alone, the user can identify which function area should
be especially carefully assessed in the subsequently required function or acceptance test.
Modular machine concepts are supported by this distribution.
The value of the checksums $MN_SAFE_GLOB_ACT_CHECKSUM[0...3] and
$MA_SAFE_ACT_CHECKSUM[0...2] is re-calculated for various events:
● When the control system powers up
● Machine control panel reset
● PI service "_N_CRCSMD"
A comparison between the MD values $MN_SAFE_GLOB_ACT_CHECKSUM[0...3] /
$MA_SAFE_ACT_CHECKSUM[0...2] and the expected values for the checksums in MD
$MN_SAFE_GLOB_DES_CHECKSUM[0...3] / $MA_SAFE_DES_CHECKSUM[0...2] is only
performed when the control boots, a discrepancy between the values is displayed using one
of the alarms mentioned below.
In this case, it is necessary to confirm the actual checksum by copying this value into MD
$MN_SAFE_GLOB_DES_CHECKSUM[0...3] / $MA_SAFE_DES_CHECKSUM[0...2] and
rebooting the control.
9.6

Interface signals

General
The safety-related input and output signals (SGE and SGA) are signals that are sent to and
received from the system through two channels.
STOP F
A STOP F (displayed using Alarms 27001, 27101 and onwards or F01711) only results in a
subsequent STOP B/A response, if at least one of the safety-related functions SBH, SG, SE
or SN is active or selected. If only the function "n < n
result in a subsequent STOP B/A response.
This means that if "n < n
SN or n<n
level).
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
WARNING
" is used as a safety function, then at least one of the SBH, SG, SE,
x
synchronization functions must be active or selected (e.g. by selecting a high SG
x
Data descriptions
9.6 Interface signals
" is active, then a STOP F does not
x
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