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FX Series Programmable Controllers

Devices in Detail 4

4-38

4.13

Index Registers

Device Mnemonic: V,Z

Purpose: To modify a specified device by stating an offset.

Alias: (V/ Z) Register

Index (register/ addressing/ modifier)
Offset(s) (register/ addressing/ modifier)
Indices
Modifier

Available forms:

For 16bit data V or Z
(2 devices)
For 32bit data V and Z combined
(1 device - Z is specified)
Operation is similar to data registers.

Devices numbered in: N/A. FX0

(S)

,FX

, FX, FX

there are two devices V and/ or Z.

For FX

2N(C)

there are 16 devices V0 - V7 and Z0 - Z7

Further uses: Can be used to modify the following devices under certain conditions;

X, Y, M, S, P, T, C, D, K, H, KnX, KnY, KnM, KnS

Example device usage:

The program shown right transfers data from D5V to D10Z.
If the data contained in register V is equal to 8 and the data in register Z is equal to 14, then:

V = 8
D5V
D5 +8 =13

D13

Z = 14
D10Z
D10 + 14 = 24

D24

Hence, the actual devices used after the modifiers V and Z have been taken into account are;
D13 and D24 and not D5 and D10 respectively.

Use of Modifiers with Applied Instruction Parameters:

•

All applied instruction parameters should be regarded as being able to use index regis-
ters to modify the operand except where stated otherwise.

Special note for FX

and FX

users:

•

Users of FX

and FX

PLC’s should note that when high speed counters (C235 to

C255) are used as operands in applied instructions, they may not be modified with V or Z
index registers.

0(S)

FX FX

(2C)

2N(C)

32 Bit

16 Bit