Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

46
1 FUNCTIONS
1.3 Communications Using the Predefined Protocol
The following figures show the configuration of the data storage area.
■When "Fixed Length/Variable Length" is "Fixed Length"
The area after the device number specified on the "Element Setting" window becomes the data storage area.
The occupied data storage area differs according to the "Unit of Stored Data".
• When "Lower Byte + Upper Byte" is selected, the same size as the data length is occupied. (However, when the data length
of a send packet is an odd number, the upper byte (lower byte for "Byte Swap") of the end device is not sent. When the data
length of a receive packet is an odd number, the last data is stored with one byte of 00H.)
• When "Lower Bytes Only" is selected, a size double the data length is occupied.
For send packet: Send data is stored by the program
For receive packet: Receive data is stored by the Ethernet-equipped module
■When "Fixed Length/Variable Length" is "Variable Length"
The area after the device number specified on the "Element Setting" window + 1 becomes the data storage area.
The occupied data storage area differs according to the "Unit of Stored Data".
• When "Lower Byte + Upper Byte" is selected, the same size as the data length + one word (length for the data length
storage area) are occupied. (However, when the data length of a send packet is an odd number, the upper byte (lower byte
for "Byte Swap") of the end device is not sent. When the data length of a receive packet is an odd number, the last data is
stored with one byte of 00H.)
• When "Lower Bytes Only" is selected, a size double the data length + one word (for data length storage area) is occupied.
For send packet: Send data is stored by the program
For receive packet: Receive data is stored by the Ethernet-equipped module
*1 The data length unit is byte fixed
Data storage area
Specified device
+ 0
+ n
(Word)
Send
packet
Data storage area
Receive
packet
Data storage area
·
Data length storage area
*1
Data storage area
Specified device
+ 1
(Word)
+ n
Send
packet
Data storage area
Receive
packet
Data storage area
+ 0

Mitsubishi Electric MELSEC iQ-RJ71EN71 Specifications

General

Brand	Mitsubishi Electric
Model	MELSEC iQ-RJ71EN71
Category	Controller
Language	English