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2410 Instruction Manual

Digital I/O Interface

4.2.1 External Relay Racks

The DIO connector pinout is compatible with a variety of solid

state relay racks (e.g., SSR-RACK08, SSR-RACK24 and

SSR-RACK48). However, there is no universal standard pinout

for relay racks, so before purchasing a rack you should verify

that it has a compatible pinout.

Most SSR racks include a terminal block, a Molex connector,

or both to connect 5VDC power to the rack. The 2410 module

provides 5VDC for this purpose on its AUX power connector

(see Figure 2).

4.2.2 Sensoray 2410TA Termination Board

On the 2410TA board, each DIO has two terminal block

connections: the active-low DIO signal (marked “-”) and +5V

(marked “+”). When a channel is functioning as an output,

these two terminals may be connected to a load as shown in

Figure 4.

Figure 4: Recommended Output Wiring

The load impedance must be high enough to limit DIO current

to its maximum allowed value. See page 7 for details.

If the load is inductive (e.g., a mechanical relay), a protection

diode should be added across the load to suppress induced

EMF that might otherwise damage the DIO circuitry.

When a channel is operating as an input (e.g., hard contact), the

active-low input signal is connected as shown in Figure 5.

Figure 5: Recommended Input Wiring

17 DIO47 42 DIO22

18 DIO46 43 DIO21

19 DIO45 44 DIO20

20 DIO44 45 DIO19

21 DIO43 46 DIO18

22 DIO42 47 DIO17

23 DIO41 48 DIO16

24 DIO40 49 NC

25 DIO7 50 GND

Table 3: DIO Connector Pinout

Pin Signal Pin Signal

2410TA

Load

2410TA

GND

1 2 3 4 5 6 7 8 9

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