User`s manual
DeviceNet (Master) Function
8-13
8
The settings in system memory related to DeviceNet communication in the JW-32CUM1 are described
below.
(1) Top address of the I/O table (When master mode and free allocation are selected)
When the JW-32CUM1 is in master mode and input/output tables that are used for the I/O message
function are freely allocated, this system memory location is used to specify the first address of the
input/output table (maximum of 512 bytes).
- Bit - See * below.
(2) Top address of the diagnostic table (When free allocation is selected)
This is a system memory location used to specify the first address of the diagnostic table (master
mode: 256 bytes, slave mode: 128 bytes). When the JW-32CUM1 is in master or slave mode, and the
diagnostic table is freely allocated (see page 8-40), it can be used to check the communication status
of the nodes (master and slaves).
- Bit - See * below.
- When this bit is ON, both "free allocation" and "fixed allocation" are disabled, and the diagnostic
table area does not exist.
(3) Top address of the Explicit message table (When master mode and free allocation are selected)
This is a system memory location used to specify the first address of the "explicit" message table (256
bytes). When the JW-32CUM1 is in master mode, and the "explicit" message table is freely allocated
(see page 8-30) it can be used for the "explicit" message function.
- Bit - See * below.
- Input/output tables while in the slave mode are allocated in the following order: input and output start
from the first address.
* When this bit is OFF, "fixed allocation" is enabled.
When this bit is ON, "free allocation" is enabled. The file addresses specified in system memory
(starting from location #300) will be the first address of each table. (Addresses in "fixed allocation"
mode are not allowed.)
When this bit is ON and the top address (starting from location #300) is not specified (left as 00(HEX)),
the top address will be "ｺ0000." Be careful because this may duplicate an address allocated to an I/O
module on the same basic rack panel.
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