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FX Series Programmable Controllers Devices in Detail 4
4-10
4.5 Pointers
Device Mnemonic: P
Purpose: Program flow control
Alias: Pointer
Program pointer
P
Available forms: Label: appears on the left of the left hand bus bar when the program is
viewed in ladder mode.
Devices numbered in: Decimal, i.e. P0 to P9, P10 to P19
Further uses: Can be used with conditional jump statements (CJ function 00)
- see page 5-5 and item ➀ on the example device usage diagram.
Can be used with call statements
- see page 5-7 and item ➁ on the example device usage diagram
Example device usage:
Available devices:
•FX1S PLC’s have 64 pointers; available from the range of P0 to P63.
•FX
1N, FX2N and FX2NC PLC’s have 128 pointers; available from the range of P0 to P127.
Jumping to the end of the program:
• When using conditional jump instructions (CJ, function 00) the program end can be
jumped to automatically by using the pointer P63 within the CJ instruction. Labelling the
END instruction with P63 is not required.
Device availability:
• For more information about device availability for individual PLC’s, please see chapter 8.
X20
CJ P0
1
P0
X20
CALL P1
2
P1
SRET
FEND