FX Series Programmable Controllers Devices in Detail 4
4-10
4.5 Pointers
Device Mnemonic:
P
Purpose:
Pro
ram flow control
Alias: Pointer
Pro
ram pointer
P
Available forms:
Label: appears on the left of the left hand bus bar when the pro
ram is
viewed in ladder mode.
Devices numbered in:
Decimal, i.e. P0 to P9, P10 to P19
Further uses:
Can be used with conditional
ump statements (CJ function 00)
- see pa
e 5-5 and item on the example device usa
e dia
ram.
Can be used with call statements (CALL function 01 -not available on FX0 and
FX0N PLC’s)
- see pa
e 5-7 and item on the example device usa
e dia
ram
Example device usage:
Available devices:
•FX
0(S)
, FX
0N
and FX PLC’s have 64 pointers; available from the ran
e of P0 to P63.
•FX
(2C)
and FX
2N(C)
PLC’s have 128 pointers; available from the ran
e of P0 to P127.
Jumping to the end of the program:
• When usin
conditional
ump instructions (CJ, function 00) the pro
ram end can be
umped to automaticall
b
usin
the pointer P63 within the CJ instruction. Labellin
the
END instruction with P63 is not required.
Device availability:
• For more information about device availabilit
for individual PLC’s, please see chapter 8.
X20
CJ P0
1
P0
X20
CALL P1
2
P1
SRET
FEND
