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1. OUTLINE
1.2.2
Outline of parameter settings
1.2.3
Outline of DN91 - slave station communication
PLC CPU
Device
X, Y, M, D, R
The following four I/O communication methods are available:
One of these four communication methods can be chosen to match the specification of each slave station.
1) Bit strobe
2) Polling
3) Change of state
4) Cyclic
Parameter setting is required in advance to communicate with slave stations.
The parameters include DeviceNet communication speed, station number (MAC ID) of DN91,
the number of I/O points of slave stations etc.
They are set in any of the following methods and stored in separate areas of E
DN91.
•
Use the sequence program.
•
Use the configuration software.
Communication between the DN91 and slave stations is outlined below.
(1) Outline of I/O Communication
I/O communication is a function to communicate I/O data with slave stations.
An outline of I/O communication is shown below.
See 4.1 I/O Communication Functions for details.
FROM
TO
DN91
Buffer memory
Input data area
(Up to 2048
points)
Output data area
(Up to 2048
points)
−
1
5
MELSEC-A
2
PROM inside
Slave station
Input
Output
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Troubleshooting
