NEC NDA-24300 manual IOC Line Monitor, Message Content

SYSTEM OPERATIONS

5.IOC LINE MONITOR

(1)Functional Outline

This function monitors the IOC port status. As a result of the monitoring by this function, the following is executed:

•When the connection with a port has been disconnected, it is reported by a message.

•When the connection with a port is set up, it is reported by a message.

•The port status is stored in the memory and updated continuously.

(2)Message Judgment Criteria

Table 6-2describes the message judgement criteria.

	Table 6-2 Message Judgment Criteria
MESSAGE	CONTENT
Port Normal	System data is assigned, and DR signal is ON.
Port Abnormal	System data is assigned, and DR signal is OFF.
Output of Port Disconnected	This message is output when Port Abnormal status has lasted for 30 seconds.
	This message is immediately output if port abnormal occurs after the IOC card is
	initialized.
Output of Port Status Restored	This message is output when DR signal is ON for the port about which Output of Port
	Disconnected message is output.

CHAPTER 6 NDA-24300

Page 400

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