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Available Memory
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1
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For the items for which double-word numeric type can be set (e.g. numeric data display,
graph, etc.), specify “double word” from the editor.
For the items for which double-word cannot be specified (e.g. read/write area, buffering area,
etc.), only lower 16 bits become the object of processing, and upper 16 bits are ignored.
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Step relay
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S area is the memory for controlling steps, in which numbers for the location of steps are
stored. For sequence instructions and word operation instructions from PLC program, S area
for 100 words is prepared, supposing the data structure of directly readable/writable unsigned
2-digit BCD (8-bit).
Step number corresponds to individual value of 2-digit BCD. It does not correspond to bit,
unlike in B, M, K or other areas. In using step numbers, you can imagine as if 100 pieces of
SC coil (00 to 99) exist in one word.
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For above explained reasons, with the POD, S area cannot be specified for switch memory or
lamp memory. To access the S area, use word operation switch. (Specify the step number
to be turned ON by the operational expression for word operation switch (transfer).)
[Example]
To set such that S00.20 turns ON when the switch on the screen is pressed,
Operation of switch: Set to word operation.
Operation expression: Set to “transfer”.
Source: Set constant “20 (h) ”.
Destination: Set “WS00”.
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Do not specify SC area for data display or as the control area of various modes, as doing so
may result in abnormal operation. However, when 2-digit or smaller numeric values are
displayed in data display mode, operation is performed normally.
1 FUJI PLC • 1
Memory TYPE Remarks
M(auxiliary relay) 0 WM as word device
K (keep relay) 1 WK as word device
B (input/output relay) 2 WB as word device
L (link relay) 9 WL as word device
F (special relay) 10 WF as word device (Read only)
TS (timer/set value) 11
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1
TR (timer/current value) 12
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1
W9 (timer/current value 0.1) 13
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1
CS (counter/set value) 14
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1
CR (counter/current value) 15
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1
BD (data memory) 16
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1
WS (step control relay) 17
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2
Wn (file memory) 18
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