Slave Function (I/O Communication) - Mitsubishi Electric MELSEC iQ-R Series User Manual

1.3

Slave Function (I/O Communication)

This function enables the communications of I/O data between the master node and the slave nodes using the buffer memory
of the RJ71DN91.
Input 128 bytes and output 128 bytes can be communicated.
The connection type is polling.
Setting for I/O communication with the master node
• Set the number of I/O points for the I/O communication with the master node with the engineering tool. This setting is
unnecessary when the value is not changed from the default value (number of I/O points: 8 bytes for each).
• The slave function parameter can be set with a program as well. ( Page 97 Setting the Parameter with a Program)
Reading/writing I/O data
• The I/O data is stored in the following buffer memory.
Buffer memory address Item
Un\G2816 to Un\G2879 Slave function receive
data
Un\G3072 to Un\G3135 Slave function transmit
data
Description
The data received from the master node is
stored.
The data transmitted to the master node is set.
Reference
Page 91 Slave function receive data
(Un\G2816 to Un\G2879)
Page 91 Slave function transmit data
(Un\G3072 to Un\G3135)
1 FUNCTIONS
1.3 Slave Function (I/O Communication)
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