Bps (Bit Push), Brd (Bit Read), And Bpp (Bit Pop) - IDEC FC4A-C10R2 User Manual

7: B I
ASIC NSTRUCTIONS

BPS (Bit Push), BRD (Bit Read), and BPP (Bit Pop)

The BPS (bit push) instruction is used to save the result of bit logical operation temporarily.
The BRD (bit read) instruction is used to read the result of bit logical operation which was saved temporarily.
The BPP (bit pop) instruction is used to restore the result of bit logical operation which was saved temporarily.
When using WindLDR , the user need not program the BPS, BRD, and BPP instructions. The circuit in the ladder diagram
shown below is converted into BPS, BRD, and BPP when the ladder diagram is compiled.
Ladder Diagram
BPS
I0 I1
BRD
I2
BPP
I3
Timing Chart
ON
I0
OFF
ON
I1
OFF
ON
I2
OFF
ON
I3
OFF
ON
Q1
OFF
ON
Q2
OFF
ON
Q3
OFF
When both inputs I0 and I1 are on, output Q1 is turned on.
When both inputs I0 and I2 are on, output Q2 is turned on.
When both inputs I0 and I3 are on, output Q3 is turned on.
7-6
Program List
Instruction
Q1
Q2
Q3
« FC4A M
ICRO
Data
LOD I0
BPS
AND I1
OUT Q1
BRD
AND I2
OUT Q2
BPP
AND I3
OUT Q3
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