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7-6

Using EEPROMs for Program Storage SIMATIC 545/555/575 System Manual

7.2 Configuring the CPU for Non-Volatile EEPROM Program Storage

Follow the instructions in this section to configure and install an EEPROM

in your 545 or 555 CPU. (The 575 CPUs do not support this option.)

NOTE: If you are installing an EEPROM and intend to download a program

(from RAM memory), ensure that the back-up battery is enabled and good

(BATT GOOD LED is on). Power to the base must be turned off and,

without a functioning back-up battery, your program may be lost when

power is restored. You may want to use TISOFT AUX 60 (SAVE PLC →

ALL) or the corresponding function in SoftShop to save your program to

disk before proceeding.

1. Place the CPU in PROGRAM Mode.

2. Ensure that switch 9 on the CPU dipswitch is turned On (to the left).

This enables the back-up battery.

3. Turn off all user-supplied power to the 545/555 base.

CAUTION

The CPU is sensitive to, and can be damaged by, electrostatic discharge.

Personnel must make contact with a static-dissipative pad and/or wear a

grounded wrist strap when handling the CPU.

4. Remove the CPU from the base assembly and place the CPU

component-side-up on a static-dissipative surface.

5. Insert the (E)EPROM into the socket on the CPU, aligning the notches

on the (E)EPROM and the socket (see Figure 7-1 or Figure 7-2,

depending on your CPU model).

6. Check the pins to make sure that they are all seated properly in the

socket.

7. Observe Jumper E18. If you intend to write to the EEPROM, ensure

that Jumper E18 is strapped. If you do not write to the EEPROM and

want to disable this feature, remove strap E18.

For the new CPU models (–1105, –1106), set the jumper on header E20

to strap the pins marked “DIP EEPROM” as shown in Figure 7-2.

8. Re-install the CPU in the base and turn the base power On. Refer to

Chapter 9 of this manual if the (E)EPROM fails to function correctly.

To copy a program into the EEPROM, see Section 7.3.

Configuring the

CPU for Portable

EEPROM Usage

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