5-140 B30 BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS55.3.18.3 Unreturned messages alarm CH1(2)SETTINGS PRODUCT SETUP DIRECT I/O UNRETURNED MESSAGES ALARM CH1(2)The B30 checks integrity of the direct input and output communication ring by counting unreturned messages. In the ringconfiguration, all messages originating at a given device should return within a pre-defined period of time. The unreturnedmessages alarm function is available for monitoring the integrity of the communication ring by tracking the rate ofunreturned messages. This function counts all the outgoing messages and a separate counter adds the messages havefailed to return. When the unreturned messages counter reaches the user-definable level specified by the UNRET MSGSALARM CH1 THRESHOLD setting and within the user-defined message count UNRET MSGS ALARM CH1 COUNT, the DIR IO CH1UNRET ALM FlexLogic operand is set.When the total message counter reaches the user-defined maximum specified by the UNRET MSGS ALARM CH1 MESSAGECOUNT 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 TeleprotectionSETTINGS PRODUCT SETUP TELEPROTECTIONDigital teleprotection transfers protection commands between two or three relays in a secure, fast, dependable, anddeterministic 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 CH1FUNCTION: DisabledRange: Enabled, Disabled UNRET MSGS ALARM CH1MESSAGE COUNT: 600Range: 100 to 10000 in steps of 1 UNRET MSGS ALARM CH1THRESHOLD: 10Range: 1 to 1000 in steps of 1 UNRET MSGS ALARM CH1EVENTS: DisabledRange: Enabled, Disabled TELEPROTECTION TELEPROTECTIONFUNCTION: DisabledRange: Disabled, Enabled NUMBER OF TERMINALS:2Range: 2, 3 NUMBER OF COMMCHANNELS: 1Range: 1, 2 LOCAL RELAY IDNUMBER: 0Range: 0 to 63 in steps of 1 TERMINAL 1 RELAY IDNUMBER: 0Range: 0 to 63 in steps of 1 TERMINAL 2 RELAY IDNUMBER: 0Range: 0 to 63 in steps of 1This option is available when an Inter-Relay Communications card is specified at the time of ordering (see theOrder Code tables). With the option, direct inputs/outputs display by default. When you enable theteleprotection feature, direct I/O is not visible.
