User manual

35
3
Addressing Overview
Addressing Overview
All the memory used for external I/O processing and internal data
processing has always both address and data (the content).
Addressing space is classified as R, L, M, K, F, TC, and W. These letters
are used to designate a specific area in memory as shown in the
following table.
Memory areas Addresses Description
External I/O area (R)
R000.0 to R127.15
• Local I/O memory area that can be set when configuring
I/O module.
• 2048 points, 128 words
R640.0 to R127.15
• Remote I/O memory area (user defined area)
• 1024 points, 64 words
Link contact (L) L000.0 to L063.15
• Link contact shared memory area, 1024 points,
Loop 0
• Can be used as internal contacts when not used as link
contacts.
Internal contact (M)
M000.0 to M127.15
• Internal auxiliary contact memory area
• 2048 points, 128 words
M000.0 to M063.15
• When link loop 1 is used, this area can be used shared
memory area for link contacts
Keep contact (K) K000.0 to K127.15
• Retentive internal auxiliary contact memory area
• 2048 points, 128 words
Special contact (F) F000.0 to F015.15
• Special internal contact memory area
• 256 points, 16 words
Timer/Counter (TC)
Contacts: TC000 to TC255
Set value: SV000 to SV255
Present value: PV000 to
PV255
•
The same 256 channels are used for contacts,
set values, or preset values.
•
TC indicates “contact”.
•
SV is Set Value, PV is Present Value.
•
The data value range of SV and PV is from 0 to 65535.
Data register (W)
W000 to W2047
• Area that retains the data in case of power failure
• Bit addressing is not possible.
• Cleared when downloading program
W0000 to W0127
• Can be configured as shared memory area for loop 0
link contacts
W0128 to W2557
• Can be configured as shared memory area for loop1
link contacts
Special register
(SR)
SR000 to SR511
• Special internal data area for processor status and RTC
• Make sure to use available areas only described in this
manual.