Siemens SINUMERIK 840C User Manual
Page 203
6 NC Machine Data (NC MD), NC Setting Data (NC SD)
09.01
6.2 General machine data (general data)
2.
Delay for removal of the servo enable signal on the measuring circuit following
"EMERGENCY STOP" and other errors resulting in immediate shutdown of the axes (e.g.
contour monitoring).
3.
Delay for removal of the servo enable signal on the measuring circuit when the PLC
revokes the servo enable for an axis.
4.
MD 156 is only active if MD 1224* is set to zero (servo enable delay).
Types of control for standard cycles
157
Default value
Lower input limit
Upper input limit
Units
see below
–
–
–
Active
–
Identifier
Software version
Entry in
MD 157
SINUMERIK
840CT
61
1.1
6111
”
840CM
62
1.1
6211
MD 157 is loaded by the NC software, and must not be changed manually.
It is used by the standard cycles, i.e. measuring cycles for the relevant control.
The applicable Software Version is only displayed in on-line mode, it is entered by the NCK
system software during runup.
Interpolation cycle
160
Default value
Lower input limit
Upper input limit
Units
4
2 *
32
–
Active on
Power On
In order to compensate for the fact that a machine's axes frequently differ in dynamic
response, the SINUMERIK 840C has been designed so that the operator can specify the ratio
of interpolation to position control (sampling interval = MD 155). The interpolation time is the
product obtained by multiplying the contents of MD160 with the contents of MD155. See
Section Axis (Analog) and Spindle Installation.
Number of IKA configurations via PLC/DB48
161
Default value
Lower input limit
Upper input limit
Units
0
0
32
–
Activve
immediately
By means of MD161 the number of IKA configurations is limited which can be controlled via
the PLC interface DB48. This MD is only effective with or released by MD 5189 bit 7=1.
Example: MD161=3
In DB48, the data words DW 16 to 73 are no longer processed. The interface is only updated
for IKA 1 to 3 (DW 10 to 15). The IKA center DW8 still applies only to DW10 to DW15. See
also the table below.
DW k
DW k+1
IKA n
DW k
DW k+1
IKA n
10
11
1
2n+8
2n+9
N
12
13
2
...
...
...
14
15
3
72
73
32
...
...
...
Explanation of the table (extract from DB48):
n= IKA number (IKA1 ... IKA32), k= data word number of DB48 (DW k)
The following is valid for all data words DW 'k'=10, 12, 14...72 (input signals: PLC to NCK):
k=2n+8
or n=(k-8)/2
The following is valid for all data words DW 'k+1'=11, 13, 15...73 (output signals: NCK to
PLC):
'k+1'=2n+9
or n=('k+1'-9)/2
_______
*
The lower limits only apply if the control is operated from a channel.
6–18
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Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)