76 model 3000 Ethernet Module / DS Connection Module Operation Manual
Chapter 7 Application Interface
7
7.2 Transmission Line Diagnosis Information
The EN7 modules mutually monitor the operation of themselves in the same segment.
A diagnostic frame is sent from one EN7 module to another in the same segment at
constant intervals of 10 seconds through Port No. 48000, and the reception of the frame
is mutually acknowledged. When the frame is received from a node, the bit of that node is
set to "1"; if no diagnostic frame is received for 60 consecutive seconds from that time,
the bit of that node is set to "0".
Information on each node has the structure shown below, and is created on the basis of
the station address (host ID) part of an IP address. (If the address is 172.16.64.11, for
example, the number 11 is applicable.)
Note: Transmission line diagnosis information function is not worked in default at IP
address free setting. It works to set option switch 0 to "on" on Engineering Tool.
7.2.1 Transmission line diagnosis information structure
Transmission line diagnosis information is managed in the structure shown below.
A diagnostic frame has been received within about 60 seconds if the corresponding bit is
"1"; no diagnostic frame has been received for 60 consecutive seconds if it is "0".
Transmission line diagnosis information on a dual transmission line system covers both
Lines A and B.
If stations are of a dual configuration, diagnostic processing takes place in the EN7
modules of both online and standby systems to verify transmission line compatibility.
Even if there is a station changeover between the online and standby systems, node
diagnosis continues.
ST15
F E D 3 2 1 0
ST14 ST13 ST3 ST2 ST1 ST0
ST31 ST30 ST29
ST19 ST18 ST17
ST16
・ ・ ・
・ ・ ・
・ ・ ・
ST255 ST254 ST253
ST243 ST242 ST241
ST240
・ ・ ・
To Next Page
Loading...
Need help?
General
