Siemens SINUMERIK 840D Description Of Functions page 104

3 Safety-Related Functions
3.5 Safely-reduced speed (SG)
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Table 3-31
Table 3-32
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3-104
SINUMERIK 840D/SIMODRIVE 611 digital SINUMERIK Safety Integrated (FBSI) - Edition 11.03
The second encoder system is connected to the "direct measuring system"
input on the 611 digital closed-loop control module.
Enabled SI function SBH/SG.
If the safety functions SE and SN are used for the spindles, gear stage
changeover must also be activated on the NCK channel (request signals
E1/E2, refer to Fig. 3-13). This is done to ensure that both channels
receive the status "axis not safely referenced" as a result of the gear
change.
The machine data assignment for the input assignment gear ratio selection
(bits 0, 1, 2) for the NCK are described in Chapter 4, "Machine data for
SINUMERIK 840D".
The PLC SGEs for selecting gear ratios are described in
Chapter 4.3, "Interface signals".
The example should be applicable for the 1st drive.
The motor encoder system is parameterized in the drive machine data.
The second encoder system is parameterized in the NCK machine data of
the control system.
Overview of encoder data for 840D
Number Name
36910 $MA_SAFE_ENC_SEGMENT_NR
36911 $MA_SAFE_ENC_MODULE_NR
36912 $MA_SAFE_ENC_INPUT_NR
36915 $MA_SAFE_ENC_TYPE
36916 $MA_SAFE_ENC_IS_LINEAR
36917 $MA_SAFE_ENC_GRID_POINT_DIST
36918 $MA_SAFE_ENC_RESOL
36920 $MA_SAFE_ENC_GEAR_PITCH
36921 $MA_SAFE_ENC_GEAR_DENOM[n]
36922 $MA_SAFE_ENC_GEAR_NUMERA[n]
36925 $MA_SAFE_ENC_POLARITY
Note:
Data is described in Chapter 4, "Machine data for SINUMERIK 840D"
Overview of encoder data for 611 digital
Number Name
1316 $MD_SAFE_ENC_CONFIG
1317 $MI_SAFE_ENC_GRID_POINT_DIST
1318 $MI_SAFE_ENC_RESOL
1320 $MI_SAFE_ENC_GEAR_PITCH
1321 $MI_SAFE_ENC_GEAR_DENOM[n]
1322 $MI_SAFE_ENC_GEAR_NUMERA[n]
Note:
Data is described in Chapter 4, "Machine data for SIMODRIVE 611digital"
The tolerance for the actual value comparison of the two encoders is
defined in the following machine data:
For 840D MD 36942:
For 611 digital MD 1342:
$MA_SAFE_POS_TOL
$MD_SAFE_POS_TOL
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11.03