Select a power supply, Prevent electrostatic discharge damage – Rockwell Automation 1771-DMC_DMC1_DMC4_DXPS Control Coprocessor User Manual User Manual
Page 20
Chapter 2
Installing the Control Coprocessor
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
1771ĆP7
Add current for:
1. I/O modules
________
2. PLC or adapter module +________
3. Main module
+________
4. Ethernet (*)
+________
5. Expander module (*)
+________
6. Total current required =________
(*) See the associated step for how to
determine ifa value or what value
should be added.
Prevent Electrostatic
Discharge Damage
Wrist strap