I

I/O-Modules
Fox Series
MPWM-2, PWM (Pulse Width Modulation) Sub module

Product Description

The MPWM-2 pulse width modulation module is a submodule, which is galvanically decoupled by means of optocouplers, for the base module. The submodule provides two PWM interfaces.

For operation in the I/O system, you can install up to four MPWM-2s in the four slots of a base module. This makes possible a maximum of 8 PWM outputs per base module. In addition, you can combine MPWM-2s with different modules, e.g. digital outputs.

The MPWM-2 module is a submodule for the Fox series. This module can control two motors by means of pulse width modulation. The maximum output voltage is 30V and the current is a maximum of 3A.

Male Connector	MPWM-2
VPP1:	+ Pos. supply voltage of driver chip for motor 1 (max. of 30V)
GND1:	- Neg. supply voltage of driver chip for motor 1
M1+:	+ Pos. connection of motor 1
M1-:	- Neg. connection of motor 1
T1:	Connection not used LED lights up on overtemperature of driver of motor 1.
VPP2:	+ Pos. supply voltage of driver chip for motor 2 (max of 30V)
GND2:	- Neg. supply voltage of driver chip for motor 2
M2+:	+ Pos. connection of motor 2
M2-:	- Neg. connection of motor 2
T2:	Connection not used LED lights up on overtemperature of driver of motor 2.

Mark to Space Ratio

You set the mark to space ratio by means of a twos complement representation with a resolution of ±9-bit (±512) + 1 sign bit. These 10-bits are arranged left-justified in the 16-bit-word. The bottom six bits are meaningless.

8000H   100%   mark (negative direction of rotation)
0H         0%      mark
7FF0H   100%   mark (positive direction of rotation)

You can set the space in 16 steps. The shortest space is 25.6ms and the longest one is 0.84s.

Bit 0-3: Setting the space

Decimal Value (Bits 0-3)	Space	Clock Frequency
0	839 ms	1.19 Hz
1	419 ms	2.38 Hz
2	210 ms	4.77 Hz
3	105 ms	9.54 Hz
4	52.4 ms	19.1 Hz
5	26.2 ms	38.1 Hz
6	13.1 ms	76.3 Hz
7	6.55 ms	152 Hz
8	3.28 ms	304 Hz
9	1.64 ms	610 Hz
10	819.2 ms	1.2 kHz
11	409.6 ms	2.4 kHz
12	204.8 ms	4.9 kHz
13	102.4 ms	9.8 kHz
14	51.2 ms	19.5 kHz
15	25.6 ms	39.1 kHz

Structure of Command Byte

Bit	Description
0	0: Off Mark 0% (Transistors are short-circuited) 1: On The set mark is output
1	0: Brake on (transistors are short-circuited) 1: Brake off
2	0: Free-wheeling on (transistors are high-resistance) 1: Free-wheeling off

Free-wheeling, brake and on/off have the following priorities:
Free-wheeling has the highest priority and on/off the lowest. If all the bits are 0, for example, free-wheeling is active, since it has the highest priority.

Structure of Status byte

Bit	Description
0	0: Off Mark 0% 1: On The set mark is output
1	0: Brake on (transistors are short-ciruited) 1: Brake off
2	0: Free wheeling on (transistors are high-resistance; PWM-bit = 0 and brake-bit 1 ) 1: Free-wheeling off
3-6	Not assigned
7	0: Temperature of motor component is ok 1: Temperature of motor component is too high.

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