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 2 8
API Mnemonic Operands Function
144 GPWM S
1
, S
2
, D General PWM Output
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S
1
*
S
2
*
D * * *
GPWM: 7 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
1
: Pulse output width S
2
: Pulse output cycle (occupies 3 addresses) D : Pulse output address
Description:
1. S
1
is specified as the pulse output width as t: 0~32,767ms.
2. S
2
is specified as the pulse output cycle as T:1~32,767ms, S
1
≦
S
2
.
3. S
2
+1 and S
2
+2 are for internal system use. They should not be used in the program. If the
data in these addresses is modified in any way, unexpected operation of the GPWM
instruction could occur. The address for the pulse output ( D) must be: Y, M or S.
4. When the GPWM instruction is executed, pulses will be sent to the Pulse output address ( D)
based on the pulse output width S
1
and pulse output cycle S
2
.
5. When S
1
≦
0, no pulses will be generated. When S
1
≧
S
2
, the pulse output address will be
always ON.
6. S
1
and S
2
can be modified when executing GPWM instruction.
Program Example:
When D0=K1000, D2=K2000 and X0= ON, the following pulses will be sent out Y20. When X0=
OFF, the Y20 output will also be OFF.
X0
GPWM D0 D2 Y20
t
T
t=1000ms
T=2000ms
Output Y20
Points to note:
1. This instruction counts by scan cycle so the maximum offset will be an ELC program scan
cycle. The value of S
1
, S
2
and ( S
2
- S
1
) should be larger than one ELC program scan cycle.
Otherwise, an error will be generated.
2. If using this instruction in a subroutine or interrupt, the GPWM output may not be accurate.