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Analog Output, 4 Channels

Many Guidance Controllers can be optionally supplied with either four or six instrument-grade Digital to Analog Converter (DAC) output channels. These DACs are primarily intended to interface the controller to 3^rd party, external motor amplifiers (although they can be utilized as general analog output signals). These external amplifiers can be used in place of or in combination with the controller's integrated motor drives. The signals for the first four DAC channels are provided on a single connector (see Figure 7-6). If supplied, the signals for the next two DAC channels are provided on the Auto/Man Daisy Chain connector.

Figure 7-6: Connector

Each of the DACs has an output range of +/- 10VDC. The DAC values have a resolution of 16 bits and are monotonic to 16 bits as well. They have a settling time of approximately 10 usec. Associated with each DAC channel is an "AMP ENABLE" digital output signal and an "AMP FAULT" digital input signal. The amp enable allows the controller to individually turn on the power to motors. The amp fault signals aid in isolating hardware problems. For the amp enable and amp fault signals, high values are at 24VDC. Figure 7-7 and Figure 7-8 illustrate how to wire the AMP ENABLE digital output signals for the first channel in both sinking and sourcing configurations. The AMP ENABLE signals for channels 2 to 6 can be wired in an analogous manner.

Figure 7-7: Amplifier Enable Output Wired as Sinking Output

Figure 7-8: Amplifier Enable Output Wired as Sourcing Output

Figure 7-9 and Figure 7-10 illustrate how to wire the AMP FAULT input signals for the first channel in both sinking and sourcing configurations. The AMP FAULT signals for channels 2 to 6 can be wired in an analogous manner.

Figure 7-9: Amplifier Fault Input Wired as Sinking Input

Figure 7-10: Amplifier Fault Input Wired as Sourcing Input

Table 7-6 details the pinout for the primary analog output connector.