Siemens SINUMERIK 840C Installation Instructions Manual page 203

6 NC Machine Data (NC MD), NC Setting Data (NC SD)
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).
157
Default value
see below
SINUMERIK 840CT
"
840CM
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.
160
Default value
4
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.
161
Number of IKA configurations via PLC/DB48
Default value
0
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
10 11
12 13
14 15
... ...
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
Types of control for standard cycles
Lower input limit Upper input limit
–
Identifier
61
62
Interpolation cycle
Lower input limit Upper input limit
2 *
Lower input limit Upper input limit
0
IKA n DW k
1 2n+8
2 ...
3 72
...
©
Siemens AG 1992 All Rights Reserved
Units
– –
Entry in
Software version
MD 157
1.1 6111
1.1 6211
Power On
Units
32 –
immediately
Units
32 –
DW k+1 IKA n
2n+9 N
... ...
73 32
6FC5197- AA50
SINUMERIK 840C (IA)
09.01
Active
–
Active on
Activve