1 COMMON ITEMS
1.3 MELSEC Data Link Functions
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Accessible range and devices
This section explains the accessible range and accessible devices when using MELSEC data link functions.
Bus interface communication
The following explains the accessible range and devices for bus interface communication.
■
Accessible range
The accessible range for bus interface communication includes the own station (C Controller module), and the CPU module
and C Controller module in a multiple CPU system.
■
Accessible devices
The devices accessible for communication via a bus are shown below.
• 'Batch' and 'Random' in the following table indicate as follows:
Batch: Batch write (mdSendEx function), batch read (mdReceiveEx function)
Random: Random write (mdRandWEx function), random read (mdRandREx function), bit set (mdDevSetEx
function), bit reset (mdDevRstEx function), random write by using a label name (mdRandWLabelEx
function), random read by using a label name (mdRandRLabelEx function)
• Bit devices can be accessed by using 'bit set' (mdDevSetEx function) and 'bit reset' (mdDevRstEx function).
• The fixed cycle communication area can be accessed only when the multiple CPU setting is configured.
• Device extension specifications (digit specification, bit specification and index specification) cannot be used.
• Accessing the host CPU
The following table shows the accessible devices when accessing the host module.
: Accessible,
: Not accessible
Device
Access method
Access
target CPU
R12CCPU-V
Input relay
X
Batch/random
Output relay
Y
Batch/random
Internal relay
M
Batch/random
Special relay
SM
Batch/random
Data register
D
Batch/random
Special register
SD
Batch/random
Link relay
B
Batch/random
Link register
W
Batch/random
File register
ZR
Batch/random
Intelligent function module device, module access device
Un\G
Batch/random
CPU buffer memory
U3En\G
Batch
Random
Fixed cycle communication area
U3En\HG
Batch
Random
C Controller module
System configuration
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