Description Of Machine Data - Siemens SINUMERIK 840D sl Function Manual

Number
37922 SAFE_STANDSTILL_DELAY
37950 SAFE_INFO_ENABLE
37954 SAFE_INFO_MODULE_NR
9.1.2

Description of machine data

General
General information about machine data and an explanation of their contents such as units,
data type, protective stage, effectiveness, etc. can be found in the following references:
Reference: /LIS1/, List Manual Machine Data SINUMERIK 840D sl
10050
MD number
Default value: 0.004
Change becomes effective after: POWER ON
Data type: DOUBLE
Meaning:
Special cases, errors,...
corresponds with..
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Identifier
$MN_SYSCLOCK_CYCLE_TIME
Basic system cycle clock
Min. input limit: 0.000125
Basic clock cycle time of the system software
The clock cycle times of cyclic tasks (position controller/IPO) are set in a multiple of this basic
clock cycle. Apart from special applications in which POSCTRL_SYSCLOCK_TIME_RATIO
is set to a value greater than 1, the basic clock cycle corresponds to the position controller
clock cycle.
For systems with PROFIBUS-DP connection, this MD corresponds to the PROFIBUS-DP
cycle time. When booting, this time is read out of the configuring file (SDP type 2000) and
written into the MD.
This MD can only be changed using the configuring file.
Note:
If this MD is reduced, then this can result in an automatic correction of POSCTRL_CYCLE_DE‐
LAY, that cannot be undone at the next increase!
Details:
The basic clock cycle is an integer multiple (SYSCLOCK_SAMPL_TIME_RATIO) of units of
the clock cycle of the measured value sampling. When the system boots, the entered value
is automatically rounded to an integer multiple.
Note:
After a power off/on, discrete timer division ratios may produce a value that is not an integer
of the input value, e.g.
Entry =0.005s
after power off/on =0.00499840
or
Entry =0.006s
after power off/on =0.0060032
9.1 Machine data for SINUMERIK 840D sl
Name
Delay time switching over to Safe Operating
Stop
SIC/SCC and PROFIsafe enable
SIC/SCC module number
Protection level: 7/2
Data descriptions
Checksums MD
Max. input limit: 0.031
Unit: s
AX[0]
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