Buffer Memory Details - Mitsubishi Electric MELSEC iQ-R C R12CCPU-V User Manual

Buffer memory details

The following shows how to read the list of buffer memory details.
Item
Address
Name
Description
Set by (when to set)
Do not change the buffer memory set by system by a program or device test. Otherwise, unintended operation
may occur.
CC-Link IE Field Network Basic function
The details of buffer memory for the CC-Link IE Field Network Basic function are as follows.
Address Name
Un to G1024 Total number of connected stations
Un\G1025 Reserved station specification status
Un\G1026 to Reserved station specification status of each
Un\G1029 station
Description
Buffer memory address of a C Controller module.
Buffer memory name of a C Controller module.
Description of the buffer memory of a C Controller module.
The following shows the timing to set each device by the system and/or a user.
(Set by)
• S: Set by system.
• U: Set by user (by a program, engineering tool, GOT, or test function from an external device).
• U/S: Set by both user and system.
(When to set)
• Initial: Data is set only when initial processing is performed (e.g. powering ON the system, changing the operating
status from STOP to RUN).
• Status change: Data is set when the status is changed for each refresh cycle.
• Status change: Data is set only when the status is changed.
• At END processing: Set for every refresh cycle.
Description
The total number of connected stations set in the parameter is stored.
(Range: 1 to 64)
The reserved station specification status of the slave station specified in
the parameter is stored. (0: Not specified, 1: Specified)
b15
• b0: Reserved station specification status
• b1 to b15: Empty (fixed to 0)
The reserved station specification status is stored with the following bit
pattern. (OFF: Other than the reserved station, ON: Reserved station)
G1026
G1027
G1028
G1029
The numbers in the figure indicate station numbers (1 to 64).
(Condition)
• Only the bit of the start station number turns ON.
• The status is not stored for the station numbers after the maximum
station number.
0
b15
16 15 14 13 12 ~
32 31 30 29 28 ~
48 47 46 45 44 ~
64 63 62 61 60 ~
Set by
(when to
set)
S (initial)
S (initial)
b1 b0
S (initial)
b0
5 4 3 2 1
21 20 19 18 17
37 36 35 34 33
53 52 51 50 49
APPX
Appendix 9 Buffer Memory
A
241