BEKA BA488CF Interface Manual
Also see for BA484DF: Manual
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Contents
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12 Fieldbus DisplayReading the keypress statusEach of the six keys is connected to a DI function block, making it simple to use them for operator confirmation. EachDI mirrors the status of the key and is not latched in any way. A momentary keypress over 50mS will be ‘stretched’ toprovide a change in status for at least 400ms. Shorter keypresses are discarded.The unit has the facility to connect external switches in addition to the front panel buttons. By selecting the appropriate“Keys” configuration in the local menu these external switches can be simple normally open or closed contacts that canbe used for a variety of basic signalling tasks.Controlling the (optional) alarm outputsThe outputs can only be controlled by configuring alarm set-points. It is not possible to control the outputs directly viathe fieldbus, nor is it possible to read the status.Configuring alarm setpointsThe alarm setpoints are primarily intended for local indication uses, and the only method of setting these up is to use thelocal configuration menu, as described in the Instruction Manual.Reading the approximate ambient tempartureThe Analogue Out Transducer Block has an INSTRUMENT_TEMPERATURE parameter which shows theapproximate temperature (+/- 5°C) of the display in degrees Celcius as a read-only 4-byte float. |
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