GE IC220SDL953, Руководство пользователя, Страница: 106 / 124

A
A-30 User manual IC220SDL953 - September 2011 GFK-2731
t
FWD
The F-Watchdog time (t
FWD
) is specified for each communication relationship in
VersaConf Safety.
The minimum achievable t
FWD
depends on the network and the controller (see
documentation for the controller used).
Within t
FWD
, the standard network and the standard controller must be able to transmit
telegrams from satellite to the IC220SDL953.
t
S
, t
IN
A 12 Achievable safety depending on the modules used
The SISTEMA software utility for the safety of control systems on machines can be
downloaded free of charge from the Internet site of the Institute for Occupational Safety
and Health of the German Social Accident Insurance, see
www.dguv.de/ifa/de/pra/softwa/sistema/index.jsp .
This Windows tool provides assistance in evaluating the safety of control systems within
the scope of EN ISO 13849-1.
According to SISTEMA, performance level PL e can be achieved with the maximum
configuration (IC220SDL953 module and 5 satellites). However, you should always check
your actual application to ascertain the level of safety that can be achieved.
t
A
Response time of the actuator Actuator data sheet
t
STOP
Stopping time of the machine Measurement
t
G
Guaranteed shutdown time Calculation: t
G
= t
IN
+ t
FWD
+ t
OUT_LPSDO
Table A-22 Key for formula and Figure A-8
Abbrevia-
tion
Meaning Note
Fluctuations in network communication and in the copy routines (e.g., including controller
STOP) result in safe communication being aborted.
When specifying the F-Watchdog time, please remember that it can be affected by future
system expansions.
If several sensors are involved in the safety function, the longest response time of the
sensors involved is included in the calculation.
If
several inputs are involved in the safety function, the longest processing time of the
inputs involved is included in the calculation.
If
several IC220SDL543 devices are involved in a safety function, the longest
F-Watchdog time is included in the calculation.
GE Intelligent Platforms recommends using the SISTEMA software utility to determine
achievable safety.