Delta MMC120 User Manual download pdf (Page 107)

107

CONFIGURATION Word

Default: 0000

Eleven bits of this 16-bit word control the configuration of the module. Bit 1 is the MSB;

bit 16 is the LSB.

Click here for the CONFIG Word Bit Map

Bits1-4-TransducerTypebits

Set these bits all to 0 if the transducer is start-stop.

If the transducer is gated, set the bits so the value of these four bits equals the number of

recirculations the gated transducer is set to (bit 1 = 8, bit 2 = 4, bit 3 = 2, and bit 4 = 1).

For example, if the transducer is set to one recirculation, bit 4 should be set. If the

transducer is set to 10 recirculations bits 1 and 3 should be set, and if it is set for 15

recirculations, all four bits should be set to 1.

When a transducer is set for multiple recirculations, there is a small time delay between

those recirculations. During this time the counter on the motion controller continues to

count, resulting in "extra" counts which are added to the TRANSDUCER COUNTS.

These extra counts use some of the 65535 maximum counts that are available, reducing

the maximum stroke the module can control to 65535 minus the "extra" counts. To

correct for this effect the module calculates the "extra" counts based on the number of

transducer recirculations and subtracts them from the transducer count. If the value of

these bits and the transducer recirculations agree, the transducer count will be slightly

positive when the transducer is at its minimum position.

If you are using a gated transducer and want resolution better than 0.001 inches, we

suggest using 10 recirculations and setting bits 1 and 3. This will give 0.0001-inch

resolution with a stroke of about 6.5 inches.

Bit 9 – Falling edge Transducer bit

When this bit is set the Transducer interface hardware is configured to respond to the

falling edge of the pulses on a start/stop type transducer. If any of the transducer type

bits (1 through 4) are set, this bit is ignored.

Bit 10 - Reverse Drive Mode bit

When this bit is set the polarity of the axis’s output voltage is reversed. This bit is useful

when you are connected to two drives which do not have differential or isolated inputs,

and you need one to extend with positive drive and the other to extend with negative

drive. (If the drives have differential or isolated inputs, you can just reverse the

connections to the drive that must extend with negative drive.) When this bit is set,

transducer counts will DECREASE with positive drive.

Warning: This bit must be set properly when the Set Parameters command is issued.

Bit 11 - Absolute Mode bit

1 2 ... 102 103 104 105 106 107 108 109 110 111 112 ... 149 150

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Delta MMC120 User Manual Page 107