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17 COMMUNICATING USING 1C FRAMES
17.4 Device Memory Read and Write
Accessible device range
The following table shows the devices and device number range that can be specified when accessing the device memory.
Access the CPU module within the range of device number that can be used by commands and the range of the device
number that can be used in the access target CPU. (Page 350 Considerations when accessing devices other than ACPU
module)
: Specify 0 (30H) or space (20H)
• Do not write data to the devices which cannot be written in the range of the special relays (M9000 to M9255)
and special registers (D9000 to D9255). For details on the special relays and special registers, refer to
manual of ACPU to be accessed.
• The range of M, L, and S devices can be specified for MELSEC-A series CPU module, however, if the range
of M is specified by L or S or vice versa, they are processed equivalently.
• For word unit specification, the head device number of bit device must be specified in multiple of 16.
• For special relay M9000 or later, (9000 + multiple of 16) can be specified.
Device Device code Device number
Device name Symbol Type Represent
ation
ACPU common
command
AnA/AnUCPU common
command
Input X Bit Hexadecimal X 0 to 7FF 0 to 1FFF
Output Y Bit Hexadecimal Y 0 to 7FF 0 to 1FFF
Internal relay M Bit Decimal M 0 to 2047 0 to 8191
Latch relay L Bit Decimal L 0 to 2047 0 to 8191
Step relay S Bit Decimal S 0 to 2047 0 to 8191
Annunciator F Bit Decimal F 0 to 255 0 to 2047
Link relay B Bit Hexadecimal B 0 to 3FF 0 to 1FFF
Timer Current value T Word Decimal TN 0 to 255 0 to 2047
Contact Bit Decimal TS
Coil Bit Decimal TC
Counter Current value C Word Decimal CN 0 to 255 0 to 1023
Contact Bit Decimal CS
Coil Bit Decimal CC
Data register D Word Decimal D 0 to 1023 0 to 8191
Link register W Word Hexadecimal W 0 to 3FF 0 to 1FFF
File register R Word Decimal R 0 to 8191 0 to 8191
Special relay M Bit Decimal M 9000 to 9255 9000 to 9255
Special register D Word Decimal D 9000 to 9255 9000
to 9255
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