Functional Safety 2016
November, 2016 - London
Page 11 of 17
Equipment
Proof Test Method (brief description)
C
PT
(%)
from the pressure actually present. If the display value and digital value are also to
be corrected, please contact MANUFACTURER
6. Restore the complete operativeness of the current loop.
7. Disable safety PLC bypassing or restore normal operation in
some other way.
8. Once the recurrent test has been carried out, the results must
be documented and stored in a suitable manner.
Logic Solver
Checking the channels of input/output modules
•
Change the input value or output value of each channel of the
modules and check if the modules work as intended.
For dual-reducndant modules, check on both modules.
Control right switch over (for Redundant CPU Modules and Input/
Output Modules)
To ensure high availability, use the following procedures to check
that switchover takes place properly on dual-redundant modules.
CPU Modules
1. To make a switch over, press the START/STOP switch in the
front of the control-side CPU module to stop it.
2. Press the START/STOP switch of the failed module once
again to restart it. The module should start up as a standby-
side.
Input/Output Modules
Use the IOM Control Right Switching Tool to make switchover on
AIO/DIO modules. This tool switches the control right of dual-
redundant AIO/DIO modules from the SENG.
By using this tool, the control right will be switched over to the
modules on the standby-side.
However, you cannot use this tool on dual-redundant serial
communication modules (ALR111, ALR121).
You can start the IOM Control Right Switching Tool from Explorer.
Switch over can be made either for a selected pair of AIO/DIO
modules or collectively on a node-by-node basis.
~95%
Solenoid
Valves
1. Bypass the safety PLC or take other appropriate actions to
avoid a false trip, following company Management of Change
(MOC) procedures.
~99%