Eaton ELC-PB, Programming Manual

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E L C P r o g r a m m i n g M a n u a l
F o r m o r e i n f o r m a t i o n v i s i t : w w w. e a t o n . c o m M N 0 5 0 0 3 0 0 3 E
3 - 3 7 0
API Mnemonic Operands Function
151 PWD S, D Detection of Input Pulse Width
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S *
D *
PWD: 5 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S : Source address D : Destination address for storing the result
Description:
1. Range of S : X10 ~ X17
2. Range of D : D0 ~ D999, occupying 2 consecutive devices. Can only be used once in the
program.
3. PWD instruction is used for detecting the time span of input signals from X10 ~ X17; the valid
frequency range is 1 ~1KHz. When M1169 = Off, the instruction will detect the time span from
the rising edge to the falling edge of the input signals (units: 100us). When M1169 = On, the
instruction will detect the time span from one rising edge of the input signal to the next rising
edge of the input signal (units: 1us). It cannot use the same input as is used in the DCNT and
ZRN instructions.
4. D occupies two consecutive words. The longest detectable time is 21,474.83647 seconds,
about 357.9139 minutes or 5.9652 hours.
5. There is no limit on the number of times this instruction can be used in a program. However,
only one instruction can be executed at a time.
Program Example:
When X0 = On, record the time span of X10 = On and store it in D1 and D0.
X0
PWD X10 D0