Hub Connection Status Monitor Function - Mitsubishi Electric FX3U-ENET User Manual

5 COMMUNICATION PROCEDURE

5.8 Hub Connection Status Monitor Function

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The current connection status of the Ethernet module and hub, the transmission
speed, and the number of times the Ethernet module detected disconnection can be
checked at the following buffer memory addresses.
Ethernet module
(1) Hub connection status area (BFM#201)
Stores the current connection status of the Ethernet module and hub and the
transmission speed.
b15 b14 b13
BFM#201 3)
(2) Disconnection detection count storage area (BFM#20995)
(a) Stores the number of disconnection detection times after initial processing is
completed.
Disconnection is detected in any of the following cases.
• Disconnection between Ethernet module and hub
• Cable removal from hub side connector
• Hub power-off
• Cable removal from Ethernet module side connector
(b) If an error has occurred 65536 times or more, a count stops at FFFF
(65535).
Write "0" to this area using a sequence program to clear the stored value.
10BASE-T/100BASE-TX,
Full duplex/half duplex
b11 b10 b9 b8
2) 1)
1) Communication mode
0: Half duplex
1: Full duplex
2) Hub connection status
0: Hub not connected/disconnected
1: Hub connected
3) Data transmission speed
0: Operating at 10BASE-T
1: Operating at 100BASE-TX
(Bits other than above are reserved for system use.)
*1 When a switching hub is used, it may not be displayed correctly.
MELSEC-F
Hub
External device
b0
*1
H
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