Siemens SINUMERIK 840D sl Function Manual page 208

Connecting Sensors/Actuators
7.3 Safe programmable logic (SPL)
In order to allow the SPL to be commissioned without the crosswise data compari-
son function constantly responding, the following "minimum NCK-SPL" can be in-
stalled in this phase:
; Simulate external SPL interface
IDS = 03 DO $A_OUTSED[1]
IDS = 04 DO $A_OUTSED[2]
; Simulate internal SPL interface
IDS = 07 DO $A_OUTSID[1]
IDS = 08 DO $A_OUTSID[2]
; Emulate PLC markers (for all markers used in the PLC)
IDS = 09 DO $A_MARKERSID[1]
IDS = 10 DO $A_MARKERSID[2]
; end of program
M17
These instructions simulate the output interfaces of the NCK-SPL and therefore
"short-circuit" the crosswise data comparison.
Warning
!
The logic used in this phase has a single channel structure and is therefore not
safe as defined in control Category 3!
The described minimum NCK-SPL must be replaced by a full NCK-SPL without
any access to $A_INSIP(D), ..., $A_MARKERSIP(D) when the PLC side is
completed!
Additional diagnostic support:
S $A_STATSID: A value not equal to 0 means that an error has occurred in the
crosswise data comparison. The error numbers are selected in the same way
as on the PLC side (see Subsection 7.3.10).
S $A_CMDSI[n]: n=1: 10x change timer value for long forced checking procedure
pulses and/or single-channel test stop logic.
S $A_LEVELSID: Indicates how many signals have different signal levels on the
NCK and PLC sides that can be presently detected.
S In addition, other NC variables or free R parameters can be written to monitor
internal states of the SPL.
The following applies to all system variables of the NCK-SPL outputs:
They can be written from and read back to the SPL program.
7-208
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 03.2006 Edition
= $A_OUTSEPD[1]
= $A_OUTSEPD[2]
= $A_OUTSIPD[1]
= $A_OUTSIPD[2]
= $A_MARKERSIPD[1]
= $A_MARKERSIPD[2]
© Siemens AG, 2006. All rights reserved
03.06