Mitsubishi Electric FX5-DP-M, User Manual

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138
APPX
Appendix 3 Buffer Memory
Input data area
■
Input data area (Un\G6144 to Un\G7167)
This area stores input data from DP-Slaves. (

Page 23 Data exchange function)
• Data length settings
Each station is assigned with a variable data length (in byte) according to the slave parameters configured with PROFIBUS
Configuration Tool (the "Slave Modules" window).
However, the DP-Slaves with a fixed data length is assigned it regardless of the slave parameters (the "Slave Modules"
window) setting.
• Range of data length
Data length can be set 244 bytes maximum per station and to 2048 bytes maximum in total for all the DP-Slaves.
When data length is set to an odd number of bytes, 00H are stored in the last upper byte.
Input data from the next station is assigned from the next buffer memory address.
Ex.
1st station: 23 bytes, 2nd station: 7 bytes
I/O data is assigned in the order of parameters configured with PROFIBUS Configuration Tool (order of FDL
address).
Modifying the parameters with PROFIBUS Configuration Tool (adding or deleting a DP-Slave) causes the
buffer memory areas to be reassigned. Review the program after modifying the parameters.
When data length is set to an odd number of bytes, upper byte leaves empty and the data from the next
station are assigned from the subsequent even address.
'Input data area' (Un\G6144 to Un\G7167) cannot be assigned to the following DP-Slaves. The addresses for
them are assigned to the DP-Slaves subsequent to them instead.
• DP-Slaves without an input data length assigned
• DP-Slaves with an input data length of 0 bytes assigned
Address Sorting order of stored data Stored input data
b8 to b15 b0 to b7
Un\G6144 The 2nd byte for the 1st station The 1st byte for the 1st station Input data from the 1st station
(Input data length: 23 bytes)
Un\G6145 The 4th byte for the 1st station The 3rd byte for the 1st station

Un\G6154 The 22nd byte for the 1st station The 21st byte for the 1st station
Un\G6155 00H The 23rd byte for the 1st station
Un\G6156 The 2nd byte for the 2nd station The 1st byte for the 2nd station Input data from the 2nd station
(Input data length: 7 bytes)
Un\G6157 The 4th byte for the 2nd station The 3rd byte for the 2nd station
Un\G6158 The 6th byte for the 2nd station The 5th byte for the 2nd station
Un\G6159 00H The 7th byte for the 2nd station

to Un\G7167 Input data from the nth station