Digital Inputs

All communication interface boards provide twelve general purpose optically isolated digital input signals that are accessed in a single IDC connector. This type of connector permits these signals to be easily interfaced to other devices. See Figure 7-11.

Figure 7-11: Connector

By setting three sets of Sinking Versus Sourcing Jumpers, these inputs can be configured as either "sinking" or "sourcing" in groups of four signals.

If an input signal is configured as "sinking" (Figure 7-12), the external equipment must provide a 5VDC to 24VDC voltage to indicate a logical high value or no voltage for a logical low. This configuration is compatible with "sourcing" (PNP) sensors.

Figure 7-12: Sinking Input Signal

If an input signal is configured as "sourcing" (Figure 7-13), the external equipment must pull the signal input pin to ground to indicate a logical high and must let the line float high to 24VDC to signal a logical low value. This configuration is compatible with "sinking" (NPN) sensors.

Figure 7-13: Sourcing Input Signal

NOTE: As shipped from the factory, all digital inputs are normally configured as "sourcing."

The pinout for the Digital Input Connector and the corresponding GPL signal numbers are described in Table 7-7.

Table 7-7: Pinout
Pin	GPL Signal Number	Description
1		24VDC
2		GND
3	10001	Digital Input 1
4	10002	Digital Input 2
5	10003	Digital Input 3
6	10004	Digital Input 4
7	10005	Digital Input 5
8	10006	Digital Input 6
9	10007	Digital Input 7
10	10008	Digital Input 8
11	10009	Digital Input 9
12	10010	Digital Input 10
13	10011	Digital Input 11
14	10012	Digital Input 12
15		24VDC
16		GND
User Plug Part No		Amp 746285-3 or Molex 22-55-2161 or Molex 90142-0016. For the Molex plugs, use Molex pins 16-02-0103 and Molex crimp tool 63811-1000.