The Ethernet interface updates these status bits every PLC I/O scan. The Ethernet status
bits normally occupy a single block of memory. Most of these bits are reserved. Five are
of interest for checking the status of the Ethernet interface:
Status Bits
Brief Description
1–2
Reserved, always 0
3
Full-duplex
4–12
Reserved, always 0
13
LAN OK
14
Resource problem
15
Reserved, always 0
16
LAN Interface OK
17-80
Reserved
Bit 3:
Full Duplex
If this bit 3 is 1, CPUE05 is operating in full-duplex Ethernet
mode. Full-duplex or half-duplex operation is automatically
negotiated between the CPUE05 and its
immediately-connected network device, usually a network
hub. If this bit is 0, CPUE05 is operating in half-duplex
Ethernet mode. This bit is only valid if bit 13 (LAN OK) is 1.
Bit 13:
LAN OK
This bit is 1 while the Ethernet interface is able to
communicate on the network. If the network is not accessible
due to local or network problems, this bit is 0. When
communication resumes, it is automatically set to 1.
Bit 14:
Resource Problem
This bit is 1 whenever the Ethernet interface has a resource
problem (i.e., lack of data memory). The bit is reset to 0 on a
subsequent PLC sweep. The Ethernet interface may or may
not be able to continue functioning, depending on the severity
of the problem. Use the PLC Fault Table to identify the
problem. The Station Manager STAT B and LOG commands
can also provide more information.
Bit 16:
LAN Interface OK
When this bit is 1, the Ethernet interface is properly
initialized. When this bit is 0, all other Ethernet status bits are
invalid.
13.5.5
Checking the Status of an Ethernet Global
Data Exchange
To check the status of any Ethernet Global Data exchange, monitor the value in the
Exchange Status word (selected during Ethernet Global Data configuration). The PLC
automatically writes exchange status information in this location when:
•
a producer/consumer period expires ( the value is set for the entire period)
•
an Ethernet Global Data configuration is stored to the PLC
•
the PLC powers up and it has an Ethernet Global Data configuration
•
the Ethernet interface configured for Ethernet Global Data is restarted
266
GFK-1503E
VersaMax PLC User Manual
For public disclosure
Summary of Contents for VersaMax PLC
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