Galil DMC-2X00 - Manual (Page 174)

For example, if block 8 is configured as an output, the following command may be issued:
OP 7,,,,7
This command will set bits 1,2,3 (block 0) and bits 65,66,67 (block 8) to 1. Bits 4 through 8 and bits
68 through 80 will be set to 0. All other bits are unaffected.
When accessing I/O blocks configured as inputs, use the TIn command. The argument 'n' refers to the
block to be read (n=0,2,3,4,5,6,7,8 or 9). The value returned will be a decimal representation of the
corresponding bits.
Individual bits can be queried using the @IN[n] function (where n=1 through 8 or 17 through 80). If
the following command is issued;
MG @IN[17]
the controller will return the state of the least significant bit of block 2 (assuming block 2 is configured
as an input).
Interfacing to Grayhill or OPTO-22 G4PB24
The DMC-2x00 controller uses one 80 Pin high density connector which requires connection to a 80
pin high density cable (Galil CABLE-80). This cable can be converted to 2 50 pin IDC connectors
which are compatible with I/O mounting racks such as Grayhill 70GRCM32-HL and OPTO-22
G4PB24. To convert the 80 pin cable, use the CB-50-80 adapter from Galil. The 50 pin ribbon cables
which connect to the CB-50-80 connect directly into the I/O mounting racks.
When using the OPTO-22 G4PB24 I/O mounting rack, the user will only have access to 48 of the 64
I/O points available on the controller. Block 5 and Block 9 must be configured as inputs and will be
grounded by the I/O rack.
Example Applications
Wire Cutter
An operator activates a start switch. This causes a motor to advance the wire a distance of 10". When
the motion stops, the controller generates an output signal which activates the cutter. Allowing 100 ms
for the cutting completes the cycle.
Suppose that the motor drives the wire by a roller with a 2" diameter. Also assume that the encoder
resolution is 1000 lines per revolution. Since the circumference of the roller equals 2
π inches, and it
corresponds to 4000 quadrature, one inch of travel equals:
4000/2 π = 637 count/inch
This implies that a distance of 10 inches equals 6370 counts, and a slew speed of 5 inches per second,
for example, equals 3185 count/sec.
The input signal may be applied to I1, for example, and the output signal is chosen as output 1. The
motor velocity profile and the related input and output signals are shown in Fig. 7.1.
The program starts at a state that we define as #A. Here the controller waits for the input pulse on I1.
As soon as the pulse is given, the controller starts the forward motion.
Upon completion of the forward move, the controller outputs a pulse for 20 ms and then waits an
additional 80 ms before returning to #A for a new cycle.
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• Chapter 7 Application Programming
DMC-2X00