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Chapter 6 Instruction Details
XBC E-Type Main Unit
6-58
Ver. 1
[Example 8.4] Precautions against Power Failure
Differences between P & K areas & Set/Reset Operation
(1) Differences between Input/Output Relay(P) and Keep Relay(K)
All the following sequences are of self-keep circuit with the same operation. However, if Output is cut off while
On and then powered again, its output state will be different.
(2) Differences in operation between Input/Output Relay(P) and Keep Relay(K) areas at SET/RST Instruction
Set/Reset Instructions have Self-Keep function to keep the state once when Output is set (On) until “Off” input.
However, because of differences between Input/Output Relay(P) Area and Keep Relay(K) Area, the
operation after power recovery will be different.
Self- keep
Memory at Power failure
P00060
P00060
On
K00000
K00000
On
On
Off
P00060
K00000
Power failed
Off
Off
On
P00060
K00000
Off
P00060
K00000
P00060
K00000
On
Off
Power failed Power recoverd
S
S
S
S
Power recoverd
Summary of Contents for XBC-DN10E
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