Digital Outputs [-EB1]

Optically-isolated solid-state relays drive the digital outputs. You can connect the digital outputs in current sourcing or current sinking mode but you must connect all four outputs in a port in the same configuration. Refer to Digital Outputs Connected in Current Sourcing Mode [-EB1] and Digital Outputs Connected in Current Sinking Mode [-EB1].

The digital outputs are not designed for high-voltage isolation applications and they should only be used with ground-referenced circuits.

You must install suppression diodes on digital outputs that drive relays or other inductive devices. To see an example of a current sourcing output that has diode suppression, refer to Digital Outputs Connected in Current Sourcing Mode [-EB1]. To see an example of a current sinking output that has diode suppression, refer to Digital Outputs Connected in Current Sinking Mode [-EB1].

The digital outputs have overload protection. They will resume normal operation when the overload is removed.

Table 3-1:     Digital Output Specifications [-EB1]

Digital Output Specifications

Value

Maximum Voltage

24 V (26 V Maximum)

Maximum Sink/Source Current

250 mA/output

Output Saturation Voltage

0.9 V at maximum current

Output Resistance

3.7 Ω

Rise / Fall Time

250 µs (2K pull up to 24V)

Reset State

Output Off (High Impedance State)

Table 3-2:     Digital Output 1 Connector Pinout [-EB1]

Pin#

Description

In/Out/Bi

Connector

1

Output Common for Outputs 4-7

 Output

2

Output 4 (Optically-Isolated)

 Output

3

Output 5 (Optically-Isolated)

Output

4

Output 6 (Optically-Isolated)

Output

5

Output 7 (Optically-Isolated)

Output

6

Output Common for Outputs 8-11

 Output

7

Output 8 (Optically-Isolated)

Output

8

Output 9 (Optically-Isolated)

Output

9

Output 10 (Optically-Isolated)

Output

10

Output 11 (Optically-Isolated)

Output

Table 3-3:     Digital Output 2 Connector Pinout [-EB1]

Pin#

Description

In/Out/Bi

Connector

1

Output Common for Outputs 12-15

 Output

2

Output 12 (Optically-Isolated)

 Output

3

Output 13 (Optically-Isolated)

Output

4

Output 14 (Optically-Isolated)

Output

5

Output 15 (Optically-Isolated)

Output

6

Output Common for Outputs 16-19

 Output

7

Output 16 (Optically-Isolated)

Output

8

Output 17 (Optically-Isolated)

Output

9

Output 18 (Optically-Isolated)

Output

10

Output 19 (Optically-Isolated)

Output

Table 3-4:     Digital Output 1 and 2 Mating Connector Ratings [-EB1]

Specification Description
Type 10-Pin Terminal Block
Part Numbers Aerotech: ECK02395
Phoenix: 1700841

Conductor Cross Section

 Solid or stranded 20...26 AWG (0.14...0.5 mm2)
Stranded, with ferrule, without plastic sleeve 20...24 AWG (0.25...0.5 mm2)
Conductor Insulation Strip Length 8 mm (5/16 in)

(1) Refer to the manufacturer website for additional information.

Figure 3-1:     Digital Outputs Schematic [-EB1]

Figure 3-2:     Digital Outputs Connected in Current Sourcing Mode [-EB1]

 

Figure 3-3:     Digital Outputs Connected in Current Sinking Mode [-EB1]