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APPENDIX A - FUNCTION BLOCK DESCRIPTIONS UM344-2
September 1995
3. Process Variable - When process variable is selected, the input will be displayed in process variable
units.
Auto Rerange automatically rescales the Process Variable in proportion to the Measured Variable in the
Sensor Input Block. It will also rescale the Measured Variable range if the Process Variable range is
changed. For example, if the Measured Variable is set at 0-100 Ohms, and the Process Variable is set at
0-500 deg C, then a change in Measured Variable range to 0-200 Ohms will result in the Process Variable
being automatically rescaled to 0-1000 deg C.
A.3 TRANSMITTER ID BLOCK
Tag ........................................................... 8 Character ASCII
Descriptor ................................................ 16 Character ASCII
Message .................................................. 32 Character ASCII
Date Format ....................................................... DD/MM/YY
Device Serial Number (8 Digit) ........................... 0 to 16777215
Short Address
Analog Mode .................................................................... 0
Digital Mode ................................................................ 1-15
The Transmitter ID block contains ASCII strings that can be entered to aid in record keeping and
identification of the transmitter. These ASCII strings include an 8-character Tag, a 16-character
Descriptor, and a 32-character Message. In addition, a date code and an 8-digit Device Serial Number
that can be used to identify the transmitter can be entered.
Set the Short Address to 0 to place the transmitter in Analog or Point-to-Point mode. Set the Address to
1-15 for Digital or Multidrop mode. NOTE
Each transmitter in a Multidrop network must have a unique address. An analog mode
transmitter should never be used in a Multidrop network.
A.4 OUTPUT BLOCK
Failsafe Level ......................................... Lo, Hi, or Last Value
The Output Block converts the internal 0 to 100% it receives to an
output signal. The input to the block represents either the actual
Process Variable when the transmitter is configured as a transmitter
only, or the valve signal when configured as a controller. A 4 mA
signal wll be output if in Digital mode.
The failsafe level is the value to which the transmitter output will go if an error is detected while the
transmitter is performing its self-diagnostic program. This value may be set at Lo (≤ 4 mA), Hi (≥ 20
mA), or at the last value the transmitter recorded before entering failsafe mode.
Tag
Description
Message
Date
Transmitter ID
Device Serial Number
Short Address
4 - 20 mA
Failsafe Level
Output
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