3. Instruction Set
3-327
API Mnemonic Operands Function
144
GPWM General PWM output
Controllers
ES2/EX2 SS2 SA2
SE SX2
Bit Devices Word devices Program Steps Type
OP X Y M S K H KnX KnY KnM KnS T C D E F
S1 *
S2 *
D ** *
GPWM: 7 steps
PULSE 16-bit 32-bit
ES2/EX2 SS2 SA2
SE SX2 ES2/EX2 SS2 SA2
SE SX2 ES2/EX2 SS2 SA2
SE SX2
Operands:
S1: Width of output pulse S2: Pulse output cycle (occupies 3 devices) D: Pulse output device
Explanations:
1. When GPWM instruction executes, pulse output will be executes on device specified by D
according to pulse output width S1 and pulse output cycle S2.
2. S1: pulse output width. Range: t = 0~32,767ms.
3. S2: pulse output cycle. Range: T = 1~32,767ms, S1 ≦ S2.
4. S2 +1 and S2 +2 are system-defined parameters, please don’t use them.
5. D: pulse output device: Y, M and S.
6. When S1 ≦ 0, no pulse output will be performed. When S1 ≧ S2, the pulse output device
remains ON.
7. S1 and S2 can be modified when GPWM instruction is being executed
Program Example:
Assume D0 = K1000, D2 = K2000. When X0 = ON, Y20 will output pulses as the following diagram.
When X0 = OFF, Y20 output will be OFF.
X0 GPWM D0 D2 Y20
tT
t=1000ms
T=2000ms
Output Y20
Points to note:
1. The instruction operates by the scan cycle; therefore the maximum error will be one PLC
scan cycle. S1, S2 and (S2 - S1) should be bigger than PLC scan cycle, otherwise malfunction
will occur during GPWM outputs.
2. Please note that placing this instruction in a subroutine will cause inaccurate GPWM outputs