Cutler-Hammer D320 PLC, User Manual

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Chapter 5: CPU Operation and Memory
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D320 Memory Addresses
Type Scope Features
External I/O Area R000.0 to R127.15 Local I/O memory area.
Remote I/O memory area.
2048 points, 128 words
L000.0 to L063.15 Link memory area.
1024 points, 64 words Link Area
M000.0 to M063.15 Link memory area for second loop.
1024 points, 64 words
Internal Contact M000.0 to M127.15 Internal auxiliary contact memory area.
2048 points, 128 words
Retentive Contact K000.0 to K127.15 Retentive internal auxiliary contact memory area.
2048 points, 128 words
System Flag F000.0 to F015.15 Special internal contact memory area.
256 points, 16 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 W2047 Word value memory area.
Used for tables, data storage, and math operations.
Cannot be designated with a bit.
System Register SR000 to SR511 Special internal data area for CPU status and RTC.
Expression Example
Bit number
• 2 digits, range is 0 to 15.
Word number
•
When used with bit number, 3 digits (000 to 127) are used.
•
When used for word number only, express in 4 digits (0000 to 3071).
Register Type
•
R, L, M, K, F, or W indicates address type.
•
The W memory contains the character area (W0000 to W2047), the timer Set
Value area (W2048 to W2303 = SV000 to SV255), the timer Present Value area
(W2304 to W2559 = PV000 to PV255), and the System Register area (W2560 to
W3071 = SR000 to SR511).
Note: The basic contact and coil instructions require a bit designation and use the 3.2 bit address
format. Comparison and application instructions most often use word parameters, and are
expressed using the 4 digit word address.
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