| Specifications | Microsoft Word - 553630 Safety Manual issue 1_2.doc sblacke |
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| Specifications | Microsoft Word - 553630 Safety Manual issue 1_2.doc sblacke |
| Business section |
| Specifications | Microsoft Word - 553630 Safety Manual issue 1_2.doc sblacke |
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| Content | Safety Manual (AADvance Controller) 4-24 Document: 553630 Issue 1.2 : April 2011 Input and Output Forcing The AADvance Workbench supports forcing of individual inputs and outputs. The Workbench uses the term locking to describe forcing. It is important the implications of forcing (or locking) of input and output points on the process and their impact on safety are understood by any person using these facilities. It is the plant operators responsibility to ensure that if forced conditions are present that they do not jeopardize the functional safety. Forcing requires the program enable key to be fitted to the 9100 Processor Base Unit and is intended only for the purposes of engineering, installation and commissioning activities. When the system is in-service, maintenance overrides for safety-related inputs and outputs should be implemented using the application program instead. The Force LED on the front of the T9110 Processor Module indicates when one or more I/O points are forced. The application program can determine how many points are currently forced; it is highly recommended that this information be used to control an additional status display and/or for logging purposes. If the forcing facility is used when the system is in-service, a safety-related input connected to an operator accessible switch shall be implemented to initiate the removal of the force condition. A list of the currently locked points is read back from the AADvance system and made available within the Workbench. Maintenance Overrides Maintenance Overrides set inputs or outputs to a defined state that can be different from the real state during safety operation. It is used during maintenance, usually to override input or output conditions in order to perform a periodic test, calibration or repair of a module, sensor or actuator. To correctly implement a maintenance override scheme within the AADvance system, the override or bypass logic shall be programmed within the Application Program, with a separate set of safety-related input points or variables enabling the bypass logic. In order to accommodate maintenance overrides safely, TÜV has documented a set of principles that shall be followed. These principles are published in the document Maintenance Override by TÜV Süddeutschland / TÜV Product Service GmbH and TÜV Rheinland. There are two basic methods to check safety-related peripherals connected to the AADvance system: |
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