Maximum Value (DWORD)

Instruction Parameters

Supported PLC Series

XPnA/1R	XPnB	XPnE	XPnF	CP3A/B/P/U CP4A~D/U	CPnE	CPnF	BP	PLC-S
✓	✓	✓	✓	✓	✓	✓	✓	✓

Supported Data Registers

	M	X	Y	K	L	F	T	C	S	Z	R	Q	D	@D	Constant
S	✓	✓	✓	✓	✓	-	✓	✓	-	✓	-	✓	✓	✓	-
D	✓	-	✓	✓	✓	-	✓	✓	-	✓	-	✓	✓	✓	-
n	✓	✓	✓	✓	✓	✓	✓	✓	-	✓	✓	✓	✓	✓	✓

Supported Flags

Flag	Bit	Support
Error	F11.0	✓
Zero	F11.1	-
Carry	F11.2	-

Number of Steps

Steps
4

Operands

Operand	Description
S	The first operand. Entries are only DWORD data registers. This is the starting register to find the largest possible number. The signed value range is -2,147,483,648 ~ 2,147,483,647 (232). The unsigned value range is 0 ~ 4,294,967,295 (232-1). The Hexadecimal value range is H00000000 ~ HFFFFFFFF.
D	The second operand. Entries are only DWORD data registers. This is where the maximum value found and its data register are saved. This requires 1 DWORD (D~D+1) and 2 WORD (D+2 & D+3) data registers.
n	The third operand. Entries are WORD data registers or constants. This is the amount of data registers to search through starting at D. The value range is 1 ~ 32,767 (215-1).

Notice

Error Flag (F11.0) Notice

The error flag, F11.0, will be ON for one scan when the address of the data register assigned by @D exceeds the range of the data register, D. The range of the data register, D, is dependent on the CPU type.

F11.0 turns ON when the value of the data for n exceeds the value range 1 ~ 32,767 (2¹⁵-1).

Instruction Behavior

The DMAX and DMAXP instructions behave as follows:

• Both instructions require 4 data registers starting at the data register, D.
  • D and D+1 save the maximum number found in the search range.
  • D+2 saves the first occurrence index of the maximum number found in the search range.
  • D+3 saves the amount of times the maximum number was found in the search range.
• If n is less than 1 or greater than 32,767, neither instruction will execute.

Examples

• Ladder Diagram