Basic Function Instruction
6-34
FUN 17 D P
CMP
COMPARE
(Compares the data of Sa and Sb and outputs the results to function Outputs)
FUN 17 D P
CMP
Operand
Sa: The register to be compared
Sb: The register to be compared
Sa, Sb may combine with V, Z, P0~P9 to
serve indirect addressing
WX WY WM WS TMR CTR HR IR OR HR HSCR RTCR SR ROR DR K
Range
Ope-
rand
WX0
∣
WX240
WY0
∣
WY240
WM0
∣
WM1896
WS0
∣
WS984
T0
∣
T255
C0
∣
C255
R0
∣
R3839
R3804
∣
R3903
R3904
∣
R3919
R3920
∣
R4047
R4096
∣
R4127
R4128
∣
R4135
R4136
∣
R4167
R5000
∣
R8071
D0
∣
D4095
16/32 bit
+/-number
Sa ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
Sb ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○ ○
● Compares the data of Sa and Sb when the compare control input "EN" =1 or "EN↑" ( P instruction) from 0 to
1. If the data of Sa is equal to Sb, then set FO0 to 1. If the data of Sa>Sb, then set FO1 to 1. If the data of
Sa<Sb, then set FO2 to 1. If the data of Sa < Sb, then set the FO2 to 1.
Example Compares the data of 16-bit register
Ladder diagram Key operations Mnemonic code
Sa :
Sb :
R
R
1
a=b
EN
X0
U/S
17.CMP
0
a>b
a<b
Y0
OUT
ORG
ORG X 0
FUN 17
Sa : R 0
Sb : R 1
FO 2
OUT Y 0
● From the above example, we first assume the data of R0 is 1 and R1 is 2, and then compare the data by
executing the CMP instruction. The FO0 and FO1 are set to 0 and FO2 (a<b) is set to 1 since a<b.
● If you want to have the compound results, such as≧、≦、< > etc., please send =、< and > results to relay first
and then combine the result from the relays.
● M1919=0, when this command in not executed, FO0, FO1, FO2 will remain in the status at last execution.
● M1919=1, when this command in not executed, FO0, FO1, FO2 are all cleared to 0.
● Control M1919 properly to obtain memory-holding function for functional command output.
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