Instruction Manual
D103412X012
Viewing Device Variables and Diagnostics
July 2013
229
Trend
Field Communicator TB > Device Diagnostic > Trend
Trend chart of Setpoint (FINAL_VALUE.VALUE [13.2]), Travel (TRAVEL.VALUE [34.2]), and Pressure A
(PRESSURE_A.VALUE [36.2]).
Device Variables
Field Communicator TB > Device Variables
All Block Modes
Block Mode: Target
The Target (TARGET [5.1]) mode is the mode requested by the user or host system. Generally, only one mode is
allowed to be set, and it must be a permitted mode as defined by the permitted attribute of the mode parameter.
Additionally, all cascade targets (Cas, Rcas) must have AUTO set.
Block Mode: Actual
This is the current mode of the block. The actual (ACTUAL [5.2]) mode may differ from the target mode due to
operating conditions of the block.
Note
Block Mode:Actual drops the AUTO bit for the cascade targets. For example, target mode might have Cas and Auto set, but actual
mode will only have Cas set.
Block Mode: Permitted
The permitted (PERMITTED [5.3]) mode defines the modes allowed for the block. This is set by the user or host system
but is restricted by the instrument to modes supported by the instrument for the particular block. Any change request
to the Target or Normal attribute is checked against the permitted attribute to ensure the requested mode is
permitted. When setting the Permitted mode, there is no check against any of the other attributes (Normal or Target
modes). Therefore, the normal or target mode attributes may have a value that is not permitted because the
permitted attribute was modified after the Normal or Target mode was set. This will have no effect on the instrument
until the user attempts to modify the Target or Normal mode. At this time these attributes are tested against the
Permitted modes, thus the user cannot change the Normal or Target modes to what was formerly permitted.
Block Mode: Normal
The normal (NORMAL [5.4]) mode is the mode the block should be in during normal operating conditions. The normal
mode is set by the user or host system and can only be set to a permitted mode (see permitted mode). The user or
host system can compare the actual mode to the normal mode and, based on the results, determine if the block is
operating normally.
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