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Chapter 9: Message transfers
9
[5] Two-layer communication with the Ethernet
In order to communicate with the Ethernet on a different layer, use the following information in the
communication format header (see page 9-19) as an extension header.
- When making a two-layer communication with the FL-net, the frame needs to contain the information
including the source, transit stations, and destination, and slot number (i.e. designating the communi-
cation path). The FL-net uses eight bits to represent a station number. For that reason, when designat-
ing a module on the Ethernet, a station number for the FL-net needs to be designated. The address is
referred to as a pseudo station number.
(a) PDA : Pseudo destination address
Designate the station number of JW-255CM that connects with the Ethernet. This
may be any value within the range of 1 to 254 that can be discriminated from other
equipment on the Ethernet.
(b) PSA : Pseudo source address
Designate the station number for the equipment sending the command. This may be
any value within the range of 1 to 254 that can be discriminated from other
equipment on the Ethernet.
With respect to the response, the pseudo target station number that is given by the
command will be set.
(c) FT0 : Frame type 0
Designate 60(H).
(d) PO0 : Transit slot number
Designate the slot number on the transit station PC that the FL-net module JW-
20FL5/20FLT is installed on. This number is 2, 3 ... up to 7 from the next position of
the control module (in case ZW-6CC is used.)
(e) EA1 : End target station address
Designate the end target station address 1 to 254 on the FL-net.
(f) FT1 : Frame type 1
Set the 40(H).
(g) Command line: Command/response line
c-ID/r-ID and after of communication format (page 9-19)
0
1
2
3
4
5
6
7
8
9
39
40
00
(H)
00
(H)
00
(H)
00
(H)
PDA
PSA
FT
0
PO
0
EA
1
FT
1
00
(H)
Command line
40 bytes
PSA
Host computer
Ethernet
PC
PC
PO
0
(JW-20FL5/20FLT)
PDA
(JW-255CM)
EA
1
(JW-20FL5/20FLT)
FL-net
[An example of using the JW-20FL5/20FLT]