Protecting Checksum - Siemens SINUMERIK 840D sl Function Manual

Data descriptions

9.5 Protecting checksum

Parameter No.
r9747[0]
r9748[0]
r9749[0]
p9810
r9881[0...11]
r0469[0,1,2]
1), 4), 5)
r0470[0,1,2]
1), 4), 5)
r0471[0,1,2]
1), 4), 5)
r0472[0,1,2]
1), 4), 5)
r0473[0,1,2]
1), 4), 5)
r0474[0,1,2]
1), 4), 5)
r0475[0,1,2]
1), 4), 5)
r9527
5)
Which parameter indices are read depends on which encoder was selected using MD $MA_SAFE_ENC_INPUT_NR.
1)
In which MD the value is saved, depends on the selected encoder type. Setting is made using MD
2)
$MC_SAFE_ENC_IS_LINEAR.
These parameters are not mapped in NCK-MD, but in Alarm 27900 and correspondingly alarm parameters changed over.
3)
These parameters are only evaluated if the encoder parameterization is valid.
4)
If the drive parameter violates the internal limits of the associated NCK-MDs, then Alarm 27038 "Axis %1 value%2 in drive
5)
parameter %3 violates the limits of NCK-MD %4" is output, and the value is not transferred into the NCK-MD.
9.5 Protecting checksum
Checksums are generated using this MD in order to detect falsification of the SI-relevant
machine data checked in the acceptance test.
In order to provide users with the most accurate information as possible about the area of the
safety relevant parameterization in which a discrepancy has occurred between the reference
and actual checksum, the machine data and the associated checksums are subdivided into:
● Machine data that are parameterized via the axis-specific SI functionality ⇒
$MA_SAFE_ACT_CHECKSUM[0...2]
● Machine data that are parameterized via the general and NCK-specific SI functionality ⇒
$MN_SAFE_GLOB_ACT_CHECKSUM[0...3]
474
Meaning
Message code
Message time, received
Message value
PROFIsafe address
Sensor Module Node Identifier
Resolution measuring steps for lin‐
ear absolute encoders
Valid bits of the redundant coarse
position value
Fine resolution of the redundant
coarse position value
Relevant bits of the redundant
coarse position value
Non-safety-related measuring
steps position value POS1
Configuration of the redundant
coarse position value
Bit 0: Count direction, up/down
Bit 1: CRC 16: LSB/ MSB first
Bit 2: MSB/LSB justified
Safety MSB of the redundant
coarse position value
Encoder evaluation type
Stored in the NCK-MD
-
3)
-
3)
-
3)
SAFE_DRIVE_PS_ADDRESS
SAFE_ENC_IDENT
SAFE_ENC_MEAS_STEPS_RE
SOL
SAFE_ENC_NUM_BITS[0]
SAFE_ENC_NUM_BITS[1]
SAFE_ENC_NUM_BITS[2]
SAFE_ENC_MEAS_STEPS_PO
S1
SAFE_ENC_CONF
SAFE_ENC_NUM_BITS[3]
SAFE_ENC_MOD_TYPE
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Alarm when changing the
MD value
-
-
-
27035
27035
27036
27035
27035
27036
27036
27035
27036
27035
Safety Integrated