Basic SFC Functions
4-7. 【ORB】
Mnemonic Function Format and Devices
ORB
(OR Block)
Parallel connection of
multiply parallel circuits
Devices: none
Program
Description
z To declare the starting point of the circuit (usually serial circuit blocks)
to the preceding circuit in parallel. Serial circuit blocks are those in
which more than one contacts in series or the ANB instruction is used.
z An ORB instruction is an independent instruction and is not associated
with any device number.
z There are no limitations to the number of parallel circuits when using an
ORB instruction in the sequential processing configuration.
z When using ORB instructions in a batch, use no more than 8 LD and
LDI instructions in the definition of the program blocks (to be
connected parallel).
Recommended sequencial
programming method：
LD X0
AND X1
LD X2
AND X3
ORB
LDI X4
AND X5
ORB
Non-preferred batch
programming
method：
LD X0
AND X1
LD X2
AND X3
LDI X4
AND X5
ORB
Mnemonic
and
Function
55
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