D-20
3.
OR (ORI) command: single device connects to a device or a block.
OR command
OR command
OR command
The structures of ORP and ORF are the same but the action is in rising-edge or falling-edge.
4.
ANB command: a block connects to a device or a block in series.
ANB command
5.
ORB command: a block connects to a device or a block in parallel.
ORB command
If there are several blocks when operate ANB or ORB, they should be combined to blocks or
network from up to down or from left to right.
6.
MPS, MRD, MPP commands: Divergent memory of multi-output. It can produce many
various outputs.
7.
The command MPS is the start of divergent point. The divergent point means the
connection place between horizontal line and vertical line. We should determine to have
contact memory command or not according to the contacts status in the same vertical line.
Basically, each contact could have memory command but in some places of ladder
diagram conversion will be omitted due to the PLC operation convenience and capacity
limit. MPS command can be used for 8 continuous times and you can recognize this
command by the symbol “
┬
”.
8.
MRD command is used to read memory of divergent point. Because the logical status is
the same in the same horizontal line, it needs to read the status of original contact to keep
on analyzing other ladder diagram. You can recognize the command MRD by the symbol
“
├
”.
