Automated Logic G4106 Технические инструкции - Страница 4

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7. Verify that there is 24Vac at the power terminals with

a voltmeter.

Turn the G4106's power switch ON and verify that the

module powers up properly.

Communications Wiring

NOTE: ALC recommends using the Network Protection

Board (ALC part no. NWPB) for guarding against

lightning-induced damage.

Check the CMnet wiring for shorts and grounds.

Turn the G4106's power switch OFF.

Terminate the CMnet communications wires to the

G4106 termination strip indicated in Figure 3. Be

sure to follow the same polarity as used throughout

the rest of the CMnet.

Turn the G4106's power switch ON.

Verify communications with the G4106 board (from

the Workstation or from a Direct-Network connected

computer) by requesting a module status (modstat)

using Netscan software.

Rev (29-AUG-97) • Module Driver v4.7

A total of 200mA is supplied to these inputs for 4-20mA

transducer wiring. If the total current required by all of the

transducers is greater than 200mA, an additional power

supply is needed. In order to check this, measure the

voltage between the "B" terminal and the ground of the

module. It should read between 18VDC and 24VDC. If it

reads less than 18VDC then the total current required is

greater than 200mA.

The G4106 provides ten universal inputs which are wired

as shown in Figure 4 and 5. These inputs may accept the

following signals.

Thermistor: 10k Ohm @ 77 °F (Precon type 2).

0-5 VDC: The output impedance of a 0-5 VDC source

should not exceed 10k Ohms. The input impedance of the

G4106 module is approximately 1M Ohm.

0-20 mA: 24 VDC loop power, 250 Ohm input

impedance.

NOTE: For a 4-20 mA passive transducer having 12V

loop input, place a 10 V, 1 W Zener diode (1N4740A) in

series with the sensor as shown in Figure 5. Without the

diode the sensor circuitry could overheat when connected

to the 24 VDC supplied by the module, causing false high

readings.

Figure 3: Wiring power and communications