3. Instruction Set
Mnemonic
Function Program steps
SS2
SX2
ORB Connect a block in parallel 1
Explanations:
The ORB instruction is used to connect a circuit block to the preceding block in parallel. Generally,
the circuit block to be connected in parallel consists of several contacts which form a serial
connection structure.
Program example:
Ladder diagram:
X0
X2
Y1
X1
X3
ORB
Block A
Block B
Instruction: Operation:
LD X0 Load NO contact X0
ANI X1 Connect NC contact X1 in series
LDI X2 Load NC contact X2
AND X3 Connect NO contact X3 in series
ORB Connect circuit block in parallel
OUT Y1 Drive Y1 coil
Mnemonic
Function Program steps
SS2
SX2
MPS
Start of branches. Stores current result
of program evaluation
1
Explanations:
As the start of branches, MPS stores current result of program evaluation at the point of
divergence.
Mnemonic
Function Program steps
SS2
SX2
MRD
Reads the stored current result from
previous MPS
1
Explanations:
MRD reads the stored current result from previous MPS and operates with the contact connected
after MRD.