Bps (Bit Push), Brd (Bit Read), And Bpp (Bit Pop) - IDEC MICROSmart FC6A Series Ladder Programming Manual

4: B I
ASIC NSTRUCTIONS

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

The BPS (bit push) instruction is used to temporarily save the result of bit logical operation.
The BRD (bit read) instruction is used to read the result of the temporarily saved bit logical operation.
The BPP (bit pop) instruction is used to restore the result of the temporarily saved bit logical operation.
When using WindLDR, the user does not need to 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.
4-6
Program List
Instruction
Q1 LOD
BPS
AND
Q2
OUT
BRD
AND
Q3
OUT
BPP
AND
OUT
FC6A S MICROS L
ERIES MART
Data
I0
I1
Q1
I2
Q2
I3
Q3
P M
ADDER ROGRAMMING ANUAL
FC9Y-B1726