ABB AC500-S - 2 Usage of Digital Standard I;Os in Functional Safety Applications up to PL C; Overview

Application Note for “Usage of AC500 digital standard I/Os in functional safety applications up to PL c (ISO 13849-1)”, V1.0.0
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2 Usage of digital standard I/Os in functional safety
applications up to PL c
2.1 Overview
In this document, we discuss the usage of AC500 digital standard I/O modules on the
input side of AC500-S Safety PLC. The output side has to be implemented using safety
output modules as further explained in the notice below. SM560-S Safety CPU has to
be used for safety logic processing and diagnostic measures for digital standard I/O
modules.
NOTICE
Usage of standard output channels on standard I/O modules in
AC500 platform for functional safety applications is not considered
in this document because of the complexity of its implementation in
practice and results in very limited cost saving (two output channels
from two different standard output modules will be needed (contact
ABB technical support at www.abb.com/PLC for more details)). As
a result, safety output channels from DX581-S module [1] or built-
in drive safety functions (Safe Torque Off, Safe Stop 1, Safely Lim-
ited Speed, etc.) accessible through PROFINET / PROFIsafe [1]
shall be used on the output side of the Safety PLC.
Figure 1 gives an overview on the minimum exemplary AC500 configuration to be used
for PL c safety functions with digital standard I/O modules (PM573 standard CPU and
DC523 digital standard I/O modules are taken as examples here but other CPUs and
I/O modules from the AC500 range could also be used).
DX581-S digital safety input/output module is included in Figure 1 as one of options for
Safety PLC output part (another option is the usage of PROFINET/PROFIsafe com-
munication to trigger safety functions in drives with safety option). In addition to avail-
able digital safety input channels on DX581-S, one can use digital standard I/O chan-
nels from standard I/O modules, like DC523.