Cấu hình lại 512 kênh của bộ điều khiển PWM (Reconfigurable 512 Channels of PWM Controller)

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23/03/2020 Case study 306 viewed

Reconfigurable 512 Channels of PWM Controller.
The PWM controller can provide the following functions:
• The frequency can be as low as 40 Hz
• The frequency can be as high as 2.5M Hz
• The high level of PWM is programmable
• The low level of PWM is programmable
• Every controller provides two independent channels of PWM output
• One PC can link to 256 PWM controllers max. in one RS-485 network. So there
are total 512 channels of PWM output.
Products: I-7188XC + X108

Application 11: Configurable 512 channels of PWM controller
1. The PWM controller can provide the following functions:
♦ The frequency can be as low as 40 Hz
♦ The frequency can be as high as 2.5M Hz
♦ The high level of PWM is programmable
♦ The low level of PWM is programmable
♦ Every controller provides two independent channels of PWM output
♦ One PC can link to 256 PWM controllers max. in one RS-485 network. So thereare total 512 channels of PWM output.
2. The hardware of PWM controller: 7188XC + X108
X1=channel_1
X2=GND
X3=channel-0
3. The firmware of PWM controller: 7521 with modification, open for reference
4. The specifications of X108: 3-channels of buffer from I/O expansion bus to X1, X2, X3
5. The command sets of PWM controller = 7521 + the following commands:

6. The configuration of 2-channels PWM controller is given as follows:
PC CA0910F COM1 of 7188XC (with RS-232 interface) for channel-0/1
7. The configuration of 512-channels of PWM controller is given as follows:
PC 7520 COM1 of 7188XC (with RS-485 interface) for channel_0/1
COM1 of 7188XC (with RS-485 interfcae) for channel_2/3
………………………………………………………………………………………..
COM1 of 7188XC (with RS-485 interfcae) for channel_511/512

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