GE Industrial Solutions Entellisys 4.0 System User Manual User Manual

Page 60

Single point functions

The operation of the Messenger and Entellisys CPU based on the state of the protection options
is summarized in Table 5-2 below:

Table 5-2 Protection options and operation of Entellisys CPU and Messenger

ST Option
(Messenger
config)

IOC Option
(Messenger
config)

Switchable
ST/IOC
Option
(Messenger
config)

Options at
Entellisys CPU

Notes

Enabled

Don’t care

NA – CPU will
have ST will set
Messenger IOC

CPU: performs ST and sets Messenger’s IOC at
user setting.
Messenger: performs ST at max setting;
Messenger has analog IOC at max, digital IOC at
user setting. CPU cannot change Messenger
protection options.

Enabled

Disabled

Don’t care

NA – CPU has
ST only

CPU: performs ST at user setting.;
Messenger: performs ST at max setting. No
analog or digital IOC. CPU cannot change
Messenger protection options.

Disabled

Enabled

Don’t care

NA – CPU sets
Messenger IOC

CPU: sets Messenger’s IOC at user setting.
Messenger has analog IOC at max, digital IOC at
user setting. CPU cannot change Messenger
protection options.

Disabled

Not a valid
state

CPU: performs ST at default setting or user
settings if they have been changed.
Messenger: performs ST at max setting, digital
IOC at max setting. No analog IOC. CPU cannot
change Messenger protection options.

Disabled

Enabled

CPU not
operating

Messenger: performs ST at max setting;
Messenger performs digital IOC at max or
previous user setting. No analog IOC.

ST ON, IOC ON

CPU: performs ST and IOC at user setting.
Messenger: performs ST at max setting, digital
IOC at user setting. No analog IOC.

ST ON, IOC OFF CPU: performs ST at user setting.

Messenger: performs ST at max setting. IOC can
only be turned OFF if ST is ON.

ST OFF, IOC ON CPU: sets Messenger’s IOC at user setting.

Messenger: performs digital IOC at user setting.
No analog IOC. ST can only be turned OFF if IOC
is ON.

ST OFF, IOC OFF
Invalid
command

Messenger: does not change protection
functions; current ST and IOC options and
settings continue to run.