Divebiss VCG-E-C-G, User Manual

VersaGateway User’s Manual

Document #:  2015006.1.pdf

PAGE  30 of  44

Divelbiss Corporation • 9778 Mt. Gilead Road • Fredericktown, Ohio 43019 • 1-800-245-2327 • www.divelbiss.com

Device Features

EEPROM Memory (ON-CHIP)

The VersaGateway Devices support two types of on-board non-volatile memory: EEPROM and  FRAM. The EEPROM memory is on-

chip (on-board the PLC on a Chip) while the FRAM is an independent device.

EEPROM memory is often useful for storing setpoint values into memory that will hold its value in the event of a loss of power. 

EEPROM memory is a relatively slow writing device (in terms of milliseconds) and has limitations. This EEPROM memory is located 

on the PLC on a Chip itself (PLCHIP-P13-51220). 

EEPROM memory should not be used in applications where the values are updated (causing the stored value to update) 

often; such as a process variable. While EEPROM memory has a long life, repeated writing (thousands of times) can cause 

a memory location to fail. EEPROM memory is more oriented to be used for storage of menu changeable setpoints that  

may change, but infrequently.

CONFIGURING THE ON CHIP EEPROM IN EZ LADDER TOOLKIT

Before the PLC on a Chip on-board EEPROM may be used in the ladder diagram, it must be added to the program’s target settings 

using the EZ LADDER Toolkit’s Project Settings Menu. 

1.  In EZ LADDER,  from the File Menu at the top, click 

PROJECT

 then 

SETTINGS

.  This will open the Project Settings Window.      

      Select 

VersaGateway

 as the target from the choices. 

2.  Click the 

PROPERTIES

 button to the right side of the window. The 

VersaGateway’s Properties

 Window will open.  Make sure

      the proper model is selected in the drop-down menu. If the EEPROM feature was already installed, it would be displayed in  

      the Devices Pane under the 

Internal

 heading (as PLCHIP_Pxx_eeprom). Refer to Figure 2-27.

3.  Click the 

ADD DEVICE

 button. The

 PLCHIP-PXX Devices

 window will open. Locate the 

PLCHIP_Pxx_eeprom

 in the Devices pane    

      of this window.

4.  Click the 

PLCHIP_Pxx_eeprom

 device (highlight). Refer to Figure 2-28. 

Figure 2-27 - VersaGateway Properties

Figure 2-28 - PLCHIP-PXX Devices - EEPROM

5. Click 

OK

. The 

PLCHIP_Pxx_eeprom Properties 

dialog will open. Leave the default settings (Num Retentive Bytes set to   0). See 

     Figure 2-29. Click 

OK

.

The VersaGateway’s On-Chip EEPROM should not be used for Retentive Memory. All Retentive features should be 

configured to use FRAM. Using on-chip EEPROM for retentive features will result in retentive data being lost.