NI SCXI-1000 SCXI-1180 Communications chassis

Analog Inputs The DMC-21x2/3 provides eight analog inputs with the addition of the DB-28040. The value of these inputs in volts may be read using the @AN[n] function where n is the analog input 1 through 8. The resolution of the Analog-to-Digital conversion is 12 bits (16-bit optional – Consult Galil). Analog inputs are useful for reading special sensors such as temperature, tension or pressure. The following examples show programs which cause the motor to follow an analog signal. The first example is a point-to-point move. The second example shows a continuous move.

Method: Read the analog input, compute the commanded position and the position error. Command the motor to run at a speed in proportions to the position error.

The Auxiliary Encoder Inputs

 The auxiliary encoder inputs can be used for general use. For each axis, the controller has one auxiliary encoder and each auxiliary encoder consists of two inputs, channel A and channel B. The auxiliary encoder inputs are mapped to the inputs 81-96. Each input from the auxiliary encoder is a differential line receiver and can accept voltage levels between +/- 12Volts. The inputs have been configured to accept TTL level signals. To connect TTL signals, simply connect the signal to the + input and leave the - input disconnected. For other signal levels, the - input should be connected to a voltage that is ½ of the full voltage range (for example, connect the - input to 6 volts if the signal is a 0 - 12 volt logic).

Input Interrupt Function 

The DMC-21x2/21x3 provides an input interrupt function which causes the program to automatically execute the instructions following the #ININT label. This function is enabled using the II m,n,o command. The m specifies the beginning input and n specifies the final input in the range. The parameter o is an interrupt mask. If m and n are unused, o contains a number with the mask. A 1 designates that input to be enabled for an interrupt, where 20 is bit 1, 21 is bit 2 and so on. For example, II,,5 enables inputs 1 and 3 (20 + 22 = 5). A low input on any of the specified inputs will cause automatic execution of the #ININT subroutine. The Return from Interrupt (RI) command is used to return from this subroutine to the place in the program where the interrupt had occurred. If it is desired to return to somewhere else in the program after the execution of the #ININT subroutine, the Zero Stack (ZS) command is used followed by unconditional jump statements.

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