L
ON
W
ORKS
I
NTERFACE
M
ODULE
8
O
PEN
N
ET
C
ONTROLLER
L
ON
W
ORKS
I
NTERFACE
M
ODULE
U
SER
’
S
M
ANUAL
Link Registers for L
ON
W
ORKS
Network Communication
L
ON
W
ORKS
network communication data is stored to link registers in the
OpenNet Controller
CPU module and the data is
communicated through the L
ON
W
ORKS
interface module.
Since seven functional modules, including a L
ON
W
ORKS
interface module, can be mounted with one
OpenNet Controller
CPU module, link registers are allocated depending on the position where the L
ON
W
ORKS
interface module is mounted.
Link Register Allocation Numbers
Note:
A number 1 through 7 comes in place of * depending on the position where the functional module is mounted, such
as OpenNet inter face module or analog I/O module. Consequently, operand numbers are automatically allocated to each
functional module in the order of increasing distance from the CPU module, star ting with L100, L200, L300, through L700.
Error Data (Status Area) L*12
When an error occurs, the I/O or ERR LED on the L
ON
W
ORKS
interface module goes on, according to the error, and a cor-
responding bit in the link register goes on. The status LED goes off when the cause of the error is removed. The error data
bit remains on until the CPU is powered up again or reset.
b15 (initialization error)
This bit goes on when the CPU module fails to acknowledge the completion of initialization for communication with the
L
ON
W
ORKS
interface module. When this bit goes on, the I/O LED also goes on.
b13 (I/O error)
This bit goes on when an error occurs during communication with the L
ON
W
ORKS
interface module through the CPU bus.
When this bit goes on, the I/O LED also goes on.
b12 (transaction timeout)
This bit goes on when the CPU module fails to receive an acknowledge reply during communication through the L
ON-
W
ORKS
network, with the acknowledge (ACKD) service enabled. When this bit goes on, the ERR LED also goes on. The
transaction timeout is enabled only when the ACKD service is selected.
b11 (transmission error)
This bit goes on when a CRC error is detected while receiving incoming data from the L
ON
W
ORKS
network. When this bit
goes on, the ERR LED also goes on.
I/O Counts (Status Area) L*13
This link register stores the transmit and receive byte counts selected in the Function Area Setting > Open Bus in
WindLDR™
.
Allocation
Number
Area
Function
Description
R/W
L*00
Data area
Receive data
Stores received data from the network
Read
L*01
Data area
Receive data
Stores received data from the network
Read
L*02
Data area
Receive data
Stores received data from the network
Read
L*03
Data area
Receive data
Stores received data from the network
Read
L*04
Data area
Transmit data
Stores transmit data for the network
Write
L*05
Data area
Transmit data
Stores transmit data for the network
Write
L*06
Data area
Transmit data
Stores transmit data for the network
Write
L*07
Data area
Transmit data
Stores transmit data for the network
Write
L*12
Status area
Error data
Stores various error codes
Read
L*13
Status area
I/O counts
Stores the byte counts of transmit/receive data
Read
L*24
ID area
Software version
Stores the user application software version
Read
L*25
ID area
Expansion module ID
Stores the user program module ID
Read
b15
b14: unused
b13
b10-b0: unused
L*12
b12
b11
b15-b12: transmit bytes
b7-b0: unused
L*13
b11-b8: receive bytes
