403
Special Instructions Section 5-28
Description PWM(––) can be used with the functions listed in the following table.
PWM(––) is used to output pulses with the specified duty factor from port 1 or
2. The output can be set to one of three frequencies: 5.9 kHz, 1.5 kHz, or 91.6
Hz. The pulse output continues until INI(61) is executed to stop it.
In order for PWM(––) to be executed, the specified port must be set for vari-
able duty factor pulse outputs in the PC Setup. Set the leftmost digit of
DM 6643 to 1 to enable variable duty factor pulse output from port 1, and set
the leftmost digit of DM 6644 to 1 to enable variable duty factor pulse output
from port 2. It is not possible to output normal pulses from a port that is set for
variable duty factor output.
Note Refer to 1-5 Pulse Output Function for more details.
Operand Settings P specifies the port where the pulses will be output. Pulses are output from
port 1 when P=001, and pulses are output from port 2 when P=002.
F specifies the frequency of the pulse output, as shown in the following table.
D specifies the duty factor of the pulse output, i.e., the percentage of time that
the output is ON. D must be BCD from 0001 to 0099 (1% to 99%). The duty
factor is 75% in the following diagram.
Flags ER: There is an error in the operand settings.
PWM(––) is executed without a Pulse I/O Board installed.
The PC Setup is not set for variable duty factor pulse output.
PWM(––) is executed in an interrupt subroutine while a pulse I/O or
high-speed counter instruction is being executed in the main program.
Indirectly addressed EM/DM word is non-existent.
(Content of *EM/*DM word is not BCD, or the EM/DM area boundary
has been exceeded.)
5-28-14 DATA SEARCH – SRCH(––)
Unit/Board Function
Pulse I/O Board Pulse outputs 1 and 2
F Frequency
000 5.9 kHz
001 1.5 kHz
002 91.6 Hz
T
t
on
=D (1% to 99%)
t
on
T
R1: First word in range
IR, SR, AR, DM, EM, HR, TIM/CNT, LR
N: Number of words
IR, SR, AR, DM, EM, HR, TIM/CNT, LR, #
Ladder Symbols Operand Data Areas
@SRCH(−− )
N
R
1
C
C: Comparison data, result word
IR, SR, AR, DM, EM, HR, LR
SRCH(−− )
N
R
1
C
To Next Page
Loading...
