Rockwell-automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User M Uživatelský manuál stáhnout pdf (Strana 20)

Chapter 2

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2-2

Before you install your control coprocessor, select an appropriate

power supply. See the Control, Communication and Information Product

Catalog, publication ICCG-1.1, for backplane current requirements.

To determine the size of power supply that you require:

1. Record the total current draw for all I/O modules in the chassis.

2. Record the current draw for the programmable controller or adapter

module in the chassis.

3. Record 2.50 Amps for each control-coprocessor main module in

the chassis.

4. When you have a main module with Ethernet (1771-DMC1 or

1771-DMC4), record 3 times the current draw for your transceiver.

If your transceiver requires 300 mA, for example, record 900 mA (or

.90 Amps) as the result of:

300 mA x 3

5. When you use a serial expander module, record 1.50 Amps for each

module in the chassis.

6. Total the values recorded in steps 1 through 5.

7. Select a power supply dependent on the input voltage required and

total current requirements recorded in step 6.

8. Select a cable for the power supply.

Important: You cannot use an external power supply and a slot-based

power supply to power the same chassis—they are not compatible.

The control coprocessor is shipped in a static-shielded container to guard

against electrostatic electrostatic discharge (ESD). ESD can damage

integrated circuits or semiconductors in the module if you touch backplane

connector pins. ESD can also damage the module when you set

configuration plugs or switches or add a SIMM (RAM memory). Avoid

electrostatic damage by observing the following precautions:

Remain in contact with an approved ground point while handling the

module (by wearing a properly grounded wrist strap).

Do not touch the backplane connector or connector pins.

When not in use, keep the module in its static-shielded container.

Select a Power Supply

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Prevent Electrostatic

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