Instruction Manual

Instruction Manual
D103434X012
Blocks
November 2014
115
When the block is in Cas mode and the CAS_IN [17] input goes bad, the block sheds mode to the next lower permitted
mode.
You can configure the shed option as follows:
Shed With Return Options
Remote cascade connection failure shifts actual mode but keeps trying to restore remote cascade (in other words, the
remote cascade target mode stays in effect).
Note
During Shed with Return Options, the actual mode is changed, while the target mode stays the same.
Normal—On failure of a remote cascade connection the block attempts to attain the highest permitted non‐remote
mode until remote cascade is restored. Cas is the highest permitted non‐remote mode and Auto is is the next
permitted non‐remote mode. If Cas or Auto are not available, the block will shed by default to Man.
Retained Target—The retained target mode is the previous target mode before it was changed to RCAS or ROUT. On
failure of a remote cascade connection the block attempts to attain the retained target mode.
Auto—On failure of a remote cascade connection the block attempts to attain Auto, if permitted, until remote cascade
is restored.
Man—On failure of a remote cascade connection the block sheds to Man until a remote cascade connection is
restored.
Shed With No Return Options
Note
During Shed with No Return Options, the target mode is changed, while the actual mode stays the same.
For any shed with no return option, the target mode changes as determined by the option. Therefore, there is no
attempt to restore the connection following failure. The behavior on change to the remote cascade target mode is
identical to that for Shed With Return Options.
Normal—On failure of a remote cascade connection the block sets the target mode to the highest permitted
non‐remote mode. Cas is the highest permitted non‐remote mode and Auto is is the next highest permitted
non‐remote mode. If Cas or Auto are not available, the block will shed by default to Man.
Retained Target—The retained target mode is the previous target mode before it was changed to RCAS or ROUT. On
failure of a remote cascade connection the block sets the target mode to the retained target mode.
Auto—On failure of a remote cascade connection, the block sets the target mode to Auto, if permitted.
Man—On failure of remote cascade connection, the block sets the target mode to Man, if permitted.
The user may configure SHED_OPT [27] so that it calls for a target mode that is not permitted. When doing this, the
mode logic uses the following rules as applied by the remote logic: