Omron SYSMAC C Series User Manual page 90

Instruction words
DIFFERIENTIATION DOWN
(DIFD)
Symbol
ny
Ladder diagram
0000 0001
=
[0501 |
The differentiation instructions perform their operations in response to
changes in input after the PC starts operating.
Coding chart Contents of data
[Address [Instruction | Data] [Outputvelay | __0500%0 1807
0200 LD 0000 Holding relay HRO00 to 915
0201 | AND 0001
0202 | DIFU (13} 0500
Function
Causes relay to operate at the trailing edge of input for one scan time
Remarks
This instruction is used to output the differentiation of an input condition to
a specified relay for one scan time.
The instruction must be set so that the output is issued for one scan time
at the trailing edge of the result register, that is, at the point when the
register's level turns from 1 to 0.
When used with the DIFFERENTIATION UP (DIFU) instruction, the
maximum number of DIFD and DIFU instructions that can be program-
med together is 48.
The differentiation instructions perform their operations in response to
changes in input after the PC starts operating.
Coding chart Contents of data
[Address [Instruction | Daa | [Outputrelay | 0500to 1807
Holding relay HROOO to 915
0200 | LD 0000
0201 | AND | 0001
0203 | DIFD{14) 0501