2.12 Safe communication
Safety data are transferred between Safety CPU and Safety I/Os using PROFIsafe profile [3]. SM560-S
Safety CPU needs a Non-safety CPU, e.g., PM573, PM583, PM592 or others with the firmware version from
V2.2.1, to communicate to Safety I/O modules. All safety-related communication takes place through the
Non-safety CPU using a “black channel” principle of data transmission [3].
The communication of Safety CPU to remote Safety I/O modules is done using PROFINET IO field bus with
a PROFIsafe profile for safe data transmission [3]. Safety and non-safety I/O modules can be mixed on a
local I/O-Bus both in central and remote configuration. PROFINET IO controller Communication Module
(CM579-PNIO) shall be used on Non-safety CPUs as a part of the “black channel” to transfer safety data to
PROFINET IO devices. PROFINET devices CI501, CI502, CI504 and CI506 (Release date: 2013 and
newer) can be used to attach Safety I/O modules in remote configurations.
Fig. 4 shows a possible system setup with PROFINET/PROFIsafe for remote Safety I/Os, sensors and
actors.
Fig. 4: AC500-S system setup with PROFINET / PROFIsafe
Overview of AC500-S Safety PLC
Safe communication
30.03.2017 AC500-S 23
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