A.6 Attach the external input module

Instruments with (0–20 mA/4–20 mA) outputs can be connected to this module. The signals can be scaled as required and be given names and units. Instruments that do not have network options can be connected to the network system using a sc1000 with Modbus or Profibus. In addition, this module can be used to monitor floating digital switches (external relay contacts as inputs). The module cannot be used to provide 24V power to a 2-wire (loop-powered) device.

This module provides two analog inputs (0–20 mA/4–20 mA), two digital inputs, or one analog input and one digital input.

Important Note: Potential on digital inputs can damage the system. Make sure that the signals on the digital inputs are floating.

1.Remove power and disconnect all cable connections to the module.

2.Place the external output module on the DIN rail to the right of the base module and slide firmly against the base module (or other connected modules).

3.Make the appropriate connections as shown in Figure 79 and Table 52.

4.Connect cables to the module and reconnect power from the instrument.

Figure 79 External input module

Table 52 Analog and digital output terminal assignments

Terminal

 

Analog

 

Digital

 

 

 

 

 

 

Assignment

 

Description

Assignment

 

Description

 

 

 

 

 

 

 

 

 

 

1–4

Not used

 

Not used

 

 

 

 

 

 

 

 

5

Input –

 

 

Not used

 

 

 

 

 

 

 

 

6

Shield

 

Analog Input 1

Not used

 

 

 

 

 

 

 

 

7

Input +

 

 

Contact 1

 

Digital Input 1

 

 

 

 

 

 

8

Not used

 

Contact 2

 

 

 

 

 

 

 

 

 

 

 

9

Input –

 

 

Not used

 

 

 

 

 

 

 

 

10

Input +

 

Analog Input 2

Contact 1

 

Digital Input 2

 

 

 

 

 

 

 

11

Shield

 

 

Not used

 

 

 

 

 

 

 

 

12

Not used

 

Contact 2

 

Digital Input 2

 

 

 

 

 

 

 

13–16

Not used

 

Not used

 

 

 

 

 

 

 

 

146

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Hach sc1000 user manual Attach the external input module, Analog and digital output terminal assignments, 146