40
Expansion Setting Area
Section 4-3
Set DM word m+39 to 1 (enabling the Expansion Setting Area) and set m+40
to the word address of an output device such as a CJ1W-OC201 Output Unit.
The high and low limit alarm outputs for inputs 1 to 4 are written to CIO n (in
the CPU Unit) every cycle, and simultaneously written to the word specified in
m+40. This way, the high and low limit alarm outputs can be transferred to an
Output Unit or other device without going through the ladder program.
Contents of the Expansion Setting Area
Note
These bits contain the same data that is output to bits 00 to 07 of CIO n.
Comparison of Operation with Enabled/Disabled Expansion Setting Area
The following example shows the operation of the alarm outputs when the
process value of input 1 exceeds the high limit alarm value.
• Conditions
Universal Input Unit unit number: 0
Special I/O Unit Area: CIO 2000 to CIO 2009
Special I/O Unit words in DM Area: D20000 to D20099
Output Unit allocation:
CIO 0004 is allocated to the 16 outputs of a CJ1W-OC221 Output Unit.
(This word is not set as the Expansion Setting Area.)
CIO 0005 is allocated to the 8 outputs of a CJ1W-OC201 Output Unit.
(This word is set as the Expansion Setting Area.)
CIO
word
Bit
Contents
0
00
Input 1 Low limit alarm output
0: Process value > Set value
1: Process value
≤
Set value
01
Input 1 High limit alarm output
0: Process value < Set value
1: Process value
≥
Set value
02
Input 2 Low limit alarm output
0: Process value > Set value
1: Process value
≤
Set value
03
Input 2 High limit alarm output
0: Process value < Set value
1: Process value
≥
Set value
04
Input 3 Low limit alarm output
0: Process value > Set value
1: Process value
≤
Set value
05
Input 3 High limit alarm output
0: Process value < Set value
1: Process value
≥
Set value
06
Input 4 Low limit alarm output
0: Process value > Set value
1: Process value
≤
Set value
07
Input 4 High limit alarm output
0: Process value < Set value
1: Process value
≥
Set value
08 to 15
Not used.
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Summary of Contents for SYSMAC CJ1W-AD04U
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