Emerson PNC001-A Series User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual Appendix A
GFK-2222AK October 2019
Serial I/O, SNP & RTU Protocols 222
Word Memory Size (%W)
Bytes = %W references configured  2
Analog Inputs (%AI)
If point faults enabled: Bytes = %AI references configured  3
If point faults disabled: Bytes = %AI references configured  2
Analog Outputs (%AQ)
If point faults enabled: Bytes = %AQ references configured  3
If point faults disabled: Bytes = %AQ references configured  2
Discrete Point Faults
If point faults enabled: Bytes = 3072
Managed Memory
(Symbolic Variable and I/O
Variable Storage)
The total number of bytes required for symbolic and I/O variables.
Calculated as follows:
[(number of symbolic discrete bits) × 3 / (8 bits/byte)]
+ [(number of I/O discrete bits) × Md / (8 bits/byte)]
+ [(number of symbolic words) × (2 bytes/word)]
+ [(number of I/O words) × (Mw bytes/word)]
Md = 3 or 4. The number of bits is multiplied by 3 to keep track of the force,
transition, and value of each bit. If point faults are enabled, the number of
I/O discrete bits is multiplied by 4.
Mw = 2 or 3. There are two 8-bit bytes per 16-bit word. If point faults are
enabled, the number of bytes is multiplied by 3 because each I/O word
requires an extra byte.
EGD (included in HWC)
Bytes = 0 if no Ethernet Global Data pages are configured
I/O Scan Set File
(included in HWC)
Based on number of scan sets used.
Note: 32 bytes of user memory are consumed if the application scans all
I/O every sweep (the default).
User Programs
Refer to User Program Memory Usage below for details on user programs.
A-6 User Program Memory Usage
Space required for user logic includes the following items.
A-6.1 %L and %P Program Memory
%L and %P are charged against your user space and sized depending on their use in your
applications. The maximum size of %L or %P is 8192 words per block.
The %L and %P tables are sized to allow extra space for RUN Mode Stores per the following
rules.
▪ If %L memory is not used in the block, the %L memory size is 0 bytes. If %L memory is
used in the block, a buffer is added beyond the highest %L address actually used in
logic or in the variable table. The default buffer size is 256 bytes, but can be changed
by editing the Extra Local Words parameter in the block Properties.
▪ The same rules apply for the size of %P memory, but %P memory can be used in any
block in the program.
▪ The buffer cannot make the %P or %L table exceed the maximum size of 8,192 words.
In such a case, a smaller buffer is used.

Emerson PNC001-A Series Specifications

General

Brand	Emerson
Model	PNC001-A Series
Category	Controller
Language	English