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ID*
From
To
Description
(14)
DEBUG STOP
DEBUG RUN
n
CoDeSys Safety online services
“Step over”
,
“Step in”
and
“Run”
n
CoDeSys Non-Safety online service
“Run”
n
“Run”
button on PM5xx Non-safety CPU
(Non-safety CPU was in “Stop“ state)
(15)
INIT
INIT
Powering off/on or
“reboot”
PLC Browser com-
mand from PM5xx Non-safety CPU
(16)
INIT
SAFE STOP
Switch address 0xFE, 0xFD or 0xFC was set on
SM560-S
* Numbers are transitions in
Ä
3.1.6 SM560-S and PM5xx interaction
SM560-S Safety CPU and PM5xx Non-safety CPU have their own firmware, boot project and application pro-
gram, which are executed separately. The only control element on PM5xx CPU hardware, which allows
changing the status of both PM5xx and SM560-S is
“Run”
button on PM5xx.
“Run”
button on PM5xx simul-
taneuously stops and starts both Safety and Non-safety CPUs. In case of SM560-S Safety CPU, even if
safety application program execution is stopped, the PROFIsafe F-Host stack [3] continues running on
SM560-S in so-called fail-safe mode, when all Safety I/O modules are passivated and “0” substitute values
are used on SM560-S for all Safety I/Os. PROFIsafe F-Host stack execution on SM560-S can be stopped
only if it goes to SAFE STOP state (no valid telegrams are generated by the device) and I-ERR LED = ON.
Online CoDeSys commands
“Run”
and
“Stop”
have the same effect on SM560-S and PM5xx as
“Run”
button on Non-safety CPU.
DANGER!
It is not possible to safely start Safety CPU using
“Run”
button on PM5xx. SM560-S always goes to
DEBUG mode (DEBUG RUN or DEBUG STOP) as soon as “Run” button is pressed on Non-safety
CPU. To bring Safety CPU back into the safe RUN mode, one has to perform powering off/on of
SM560-S or use “reboot” command on PM5xx CPU.
Online CoDeSys commands
“Run”
and
“Stop”
have the same effect on SM560-S and PM5xx as
“Run”
button on Non-safety CPU.
Depending on PM5xx parameter "Behaviour of Outputs in Stop”, “Stop on Error Class” and “Warmstart on E2
failure” setting in system configuration, one can influence the overall system behaviour of Safety and Non-
safety CPUs. This, however, does not compromise on system safety. Figure 3.6 gives an overview on how
PM5xx system parameter setting influences SM560-S safety telegram flow.
AC500-S Safety Modules
SM560-S Safety CPU > SM560-S and PM5xx interaction
30.03.2017
AC500-S
51