34 D50 PLC User's Manual
Types R, L, M, and K can be used for either bits or words.
• A bit address is composed of a character (R, L, M, K, F), a three digit word address (000 to
127), a decimal point, and a bit address (0 to 15). The timer/counter contact is represented by
the TC label followed by three digits. The three digits indicate the channel number of the
timer/counter (TC000 to TC255).
• A word address is composed of a character (R, L, M, K, W) and a four digit number (i.e.
W0000 to W0255). Special areas of word memory have alternate designations. For example,
words W2560 to W2815 are also referred to as the System Registers, and can be represented
as SR0000 to SR0511.
• The bit address indicates an On (1) or Off (0) state. The byte address is composed of 8 bits
that holds data values of 0 to 255. The word address is composed of 16 bits that holds data
values of 0 to 65,535.
D50 Memory Addresses
Type Scope Features
External I/O Area R000.0 to R003.7
R015.0 to R018.5
Local I/O memory area.
56 points, 8 words
Special I/O Area R004 to R014
R019 to R029
Configuration register for High-speec counters,
Pulse Output, Input delay, and Pulse catch.
Internal Contact M000.0 to M031.15 Internal auxiliary contact memory area.
512 points, 32 words
Retentive Contact K000.0 to K015.15 Retentive internal auxiliary contact memory area.
256 points, 16 words
System Flag F000.0 to F001.15 Special internal contact memory area.
32 points, 2 words
Timer/Counter TC000 to TC255
Set Value: W2048 (SV000) to
W2303 (SV255)
Present Value: W2304 (PV000) to
W2559 (PV255)
256 channel common use.
TC is contact signal or “Done” bit.
SV is Set Value, PV is Present Value.
SV can hold values from 0 to 65535.
Data Word W0000 to W0255 Word value memory area.
Used for tables, data storage, and math operations.
Cannot be designated with a bit.
System Register SR000 to SR255 Special internal data area for CPU status.
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