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Section 2 Operation
However, there is a deviation from this behavior. The Process Graphics (PG) aspect
Local Devices shows individual Program Card indications, that is, the status of SCA
and SCB are displayed.
It is recommended to use the System Status Viewer from Single Node Access
structure because this provides clarity on the actual status in each node.
Operating Instructions
Command Propagation
When an object is selected in a dual Safeguard system, the orders are issued to both
control branches. The selection process consumes up to three seconds depending on
the load situation. It is recommended to wait at least this amount of time before an
order is given to ensure that both control branches receive the order.
System Synchronization
A prerequisite for the dual concept is synchronized application software in the
operation mode.
The dual controllers will not be synchronized if one of the controller is disconnected
from the operator workplace. In this case, the operator should to initiate a restart of
the disconnected controller to synchronize the dual controllers.
Bypass Management
Bypass Management functions are controlled by configuration parameters in the
system. Refer to Safeguard 400 Series Safety Manual (3BNP000432*) for more
information on this feature.
If one of the controller in a dual Safeguard system is connected to the MB300
network is restarted, trend logging stops progressing for a short period of time.
3BNP004849-600
Operating Instructions
23
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