Mitsubishi Electric MELSEC-L SERIES Basic User Manual page 107

Item
Data Storage Area
Specification
*1 Do not set local devices.
*2 Set within the device range specified in the "Device" window of PLC Parameter.
The following describes the configuration of the data storage area.
(a) When "Fixed Length/Variable Length" is "Fixed Length"
An area starting from the device number which is specified in the "Element Setting" window is considered as
the data storage area.
The data storage area to be occupied varies depending on the setting of "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 last 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 00
• When "Lower Bytes Only" is selected, twice the size of the data length is occupied.
Specified device
(Word)
+ 0
Data storage area
+ n
CHAPTER 11 DATA COMMUNICATIONS USING THE PREDEFINED PROTOCOL
Specify a start device to store variable value.
Available devices are as follows:
*1*2
• Internal user
Input relay (X)
Output relay (Y)
Internal relay (M)
Latch relay (L)
Link relay (B)
Data register (D)
Link register (W)
*2
• File register
File register (R, ZR)
• Buffer memory
G device (G) (Send/receive area for predefined protocol support function (address: 4800
.)
H
Send
packet
Send packet: The user stores the send data.
Receive packet: The E71 stores the receive data.
Receive
packet
Description
Data storage area
Data storage area
11
to 4FFF ))
H H
105