User's Manual

CHAPTER 6 NDA-24300
Page 400
Issue 1
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 6-2 describes 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.