User Manual M3000® Automation System / MSC II (Moog Servo ...

10 MSC II (Moog Servo Controller) Serial Interfaces
10.16 Serial Interfaces
The MSC II provides the following serial interface:
• SIO interface with «SIO» front panel connector
SIO interface according to TIA/EIA 232 (previously RS 232):
The SIO interface's communication parameters are set in the application
program.
Terminal assignment of the serial interfaces:
�-"10.4.1-Terminal Assignment" on page 78
Serial interface cables:
�-"7.4-Serial TIA/EIA Interface Cables" on page 54
10.17 Safety Functions
10.17.1 Watchdog
The MSC II control module provides a function for monitoring whether the
software is working properly. When there is a fault, this function switches all
digital outputs to zero potential condition and stops fieldbus communication.
As a result, the user can set up systems that have a greatly reduced risk of
fatal malfunctions.
In the MSC II control module, this function is implemented in the
M_WATCHDOG function block, which can be used in the application program
to be monitored. If this function block is used, it must be enabled and triggered
cyclically in order to keep the outputs enabled.
When there is a fault (when the application program can no longer trigger the
function block within the set time period), the outputs will be disabled.
If the M_WATCHDOG function block is not used in the application program,
the MSC II control module's watchdog will not operate. In this case, the outputs
will always be enabled and they will output the value calculated in the
application program.
The digital output 'Outputs Enabled' indicates the enabled state of all
digital outputs and the MSC II’s E-bus and fieldbus communication.
10.17.2 'Outputs Enabled' Output (LED «OutEN»)
WARNING If there is a defect in an output stage, the 'Outputs Enabled'
signal will not necessarily shut down all of the
outputs securely.
The digital output 'Outputs Enabled' indicates the enabled state of all digital
outputs and the MSC II’s E-bus and fieldbus communication. It can be used
to signalize another controller that all of the MSC II control module's outputs
were disabled.
Serial Interfaces
of the MSC II
Watchdog of the MSC II
control module
'Outputs Enabled' Output
(LED «OutEN») of the
MSC II control module
© Moog GmbH User Manual M3000 ® and MSC II (CA65865-001; Version 1.1, 08/08) 111