Mitsubishi Electric MELSEC-Q Structured Programming Manual page 18

FXCPU Structured Programming Manual
[Device & Common]
7. Extension register (R) and extension file register (ER)
Only FX /FX
3G 3GC
Extension registers(R) are extended type of data registers (D), and backed up against power interruption by
battery in FX
3U
In FX /FX
3G 3GC
is connected.
FX /FX /FX
3G 3GC
(ER). However, FX
attached.
8. Index register (V and Z)
Registers (V) (Z) are available for indexing.
Add index registers (V) (Z) to other devices as follows:
[In the case of "V0 = 5, Z0 = 5]
D100V0 = D105, C20Z0 = C25 ← Device number + Value of V
Data registers and index registers are used to indirectly specify set values of timers and counters, or used in
instructions.
9. Pointer (P and I)
Pointers are classified into the branch type and the interrupt type.
• Branch pointers (P) specify the jump destination of the CJ (FNC 00: Conditional jump) and CALL
(subroutine call) instructions.
• Interrupt pointers (I) specify the interrupt routine for input interrupt, timer interrupt or counter interrupt.
10.Constant (K, H and E)
Among various numeric values used in PLCs, "K" indicates "decimal integer", "H" indicates "hexadecimal
value", and "E" indicates "real number (floating point data)".
Constants are used for set values and current values of timers and counters as well as input variables of
instructions.
16
/FX /FX PLCs support extension registers (R) and extension file registers (ER).
3U 3UC
/FX PLCs.
3UC
PLCs, general type devices can be backed up against power interruption if an optional battery
/FX PLCs can store the contents of extension registers (R) in extension file registers
3U 3UC
/FX PLCs can use extension file registers (ER) only while a memory cassette is
3U 3UC
1.1 Devices Constructing PLC
→ Refer to Section 2.9.
→ Refer to Section 2.10.
or Z
→ Refer to Section 2.11.
→ Refer to Chapter 3.
1 Device Outline