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FX Series Programmable Controllers Basic Program Instructions 2
2-13
2.13 MPS, MRD and MPP
Basic points to remember:
- Use these instructions to connect output coils to the left hand side of a contact.
Without these instructions connections can onl
y
be made to the ri
g
ht hand side of the
last contact.
- MPS stores the connection point of the ladder circuit so that further coil branches can
recall the value later.
- MRD recalls or reads the previousl
y
stored connection point data and forces the next
contact to connect to it.
- MPP pops (recalls and removes) the stored connection point. First, it connects the next
contact, then it removes the point from the temporar
y
stora
g
e area.
- For ever
y
MPS instruction there MUST be a correspondin
g
MPP instruction.
- The last contact or coil circuit must connect to an MPP instruction.
-At an
y
pro
g
rammin
g
step, the number of active MPS-MPP pairs must be no
g
reater than
11.
Mnemonic Function Format Devices Program steps
MPS
(Point Store)
Stores the current
result of the
internal PLC
operations
N/A 1
MRD
(Read)
Reads the current
result of the
internal PLC
operations
N/A 1
MPP
(PoP)
Pops (recalls and
removes) the
currentl
y
stored
result
N/A 1
MPS
MRD
MPP
MPS, MRD and MPP usage:
• When writin
g
a pro
g
ram in ladder format, pro
g
rammin
g
tools automaticall
y
add all
MPS, MRD and MPP instructions at the pro
g
ram conversion sta
g
e. If the
g
enerated
instruction pro
g
ram is viewed, the MPS, MRD and MPP instructions are present.
• When writin
g
a pro
g
ram in instruction format, it is entirel
y
down to the user to enter all
relevant MPS, MRD and MPP instructions as required.