Ams trex™ Device Communicator

Fieldbus block modes
The resource, transducer, and all function blocks in the device have modes of operation.
These modes control the operation of the block. Every block supports both automatic
(Auto) and out of service (OOS) modes. Other types of modes that may also be supported
are Cas, RCas, ROut, IMan and LO.
You can change the mode by tapping the mode button that is displayed at the top of the
screen. The mode button displays the fieldbus logo and lists the current mode for the
block.
Mode
Description
Auto
The functions performed by the block will execute. If the block has any
outputs, these will continue to update. This is typically the normal
operating mode.
Field Communicator application
User Guide
September 2021
108
User Guide

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Mode
Description
Out of Service (OOS)
The functions performed by the block will not execute. If the block has
any outputs, these will typically not update and the status of any values
passed to other blocks is “BAD”. Before you change the configuration of
the block, change the mode of the block to OOS. When the changes are
complete, change the mode back to Auto.
Mode parameters
Mode parameters change the block mode from one state to another. For example, you
may want to change from 
Auto
mode to 
Out of Service
.
In the resource and transducer blocks, the mode parameters are often in the 
Process
menu. In all other function blocks, the parameters are in the 
Common Config
menu.
Mode
Description
Target
The mode that is assigned to a block and is used to change a block to
a desired mode.
Actual
The current mode of the block.
Permitted
The modes that are allowed for a block. Setting the Permitted modes
prevents unauthorized changes to the operating mode of a block. To
do this, configure the Block:Mode Permitted parameter to allow only
the desired operating modes. It is recommended to always select
OOS
as one of the Permitted modes.
Normal
The mode that the block should be set to during normal operation
conditions.