CHAPTER 5: SETTINGS
PRODUCT SETUP
N60 NETWORK STABILITY AND SYNCHROPHASOR MEASUREMENT SYSTEM – INSTRUCTION MANUAL
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5.3.18.3 Unreturned messages alarm CH1(2)
SETTINGS
PRODUCT SETUP
DIRECT I/O
UNRETURNED MESSAGES ALARM CH1(2)
The N60 checks integrity of the direct input and output communication ring by counting unreturned messages. In the ring
configuration, all messages originating at a given device should return within a pre-defined period of time. The unreturned
messages alarm function is available for monitoring the integrity of the communication ring by tracking the rate of
unreturned messages. This function counts all the outgoing messages and a separate counter adds the messages have
failed to return. When the unreturned messages counter reaches the user-definable level specified by the
UNRET MSGS
ALARM CH1 THRESHOLD
setting and within the user-defined message count
UNRET MSGS ALARM CH1 COUNT
, the
DIR IO CH1
UNRET ALM
FlexLogic operand is set.
When the total message counter reaches the user-defined maximum specified by the
UNRET MSGS ALARM CH1 MESSAGE
COUNT
setting, both the counters reset and the monitoring process is restarted.
Configure the operand to drive an output contact, user-programmable LED, or selected communication-based output.
Latching and acknowledging conditions, if required, are programmed accordingly.
The unreturned messages alarm function is available on a per-channel basis and is active only in the ring configuration.
The total number of unreturned input and output messages is available as the
ACTUAL VALUES
STATUS
DIRECT INPUTS
UNRETURNED MSG COUNT CH1
actual value.
5.3.19 Teleprotection
SETTINGS
PRODUCT SETUP
TELEPROTECTION
Digital teleprotection transfers protection commands between two or three relays in a secure, fast, dependable, and
deterministic way. Possible applications are permissive or blocking pilot schemes and direct transfer trip (DTT).
Teleprotection can be applied over any analog or digital channels and any communications media, such as direct fiber,
copper wires, optical networks, or microwave radio links. A mixture of communication media is possible.
UNRETURNED
MESSAGES ALARM CH1
UNRET MSGS ALARM CH1
FUNCTION: Disabled
Range: Enabled, Disabled
UNRET MSGS ALARM CH1
MESSAGE COUNT: 600
Range: 100 to 10000 in steps of 1
UNRET MSGS ALARM CH1
THRESHOLD: 10
Range: 1 to 1000 in steps of 1
UNRET MSGS ALARM CH1
EVENTS: Disabled
Range: Enabled, Disabled
TELEPROTECTION
TELEPROTECTION
FUNCTION: Disabled
Range: Disabled, Enabled
NUMBER OF TERMINALS:
2
Range: 2, 3
NUMBER OF COMM
CHANNELS: 1
Range: 1, 2
LOCAL RELAY ID
NUMBER: 0
Range: 0 to 63 in steps of 1
TERMINAL 1 RELAY ID
NUMBER: 0
Range: 0 to 63 in steps of 1
TERMINAL 2 RELAY ID
NUMBER: 0
Range: 0 to 63 in steps of 1
This option is available when an Inter-Relay Communications card is specified at the time of ordering (see the
Order Code tables). With the option, direct inputs/outputs display by default. When you enable the
teleprotection feature, direct I/O is not visible.