Application and Installation Guide EMCP 4 SCADA Data Links
©2013 Caterpillar
All rights reserved. Page 17
CHANGING PASSWORDS
The SCADA, Level 1, or Level 2 passwords can be changed by writing the new password to the SCADA
Password (724), Level 1 Password (708), or Level 2 Password (716) register, as long as the appropriate
access level is obtained:
To change the Level 1 password, Level 1 access must be obtained.
To change the SCADA or Level 2 passwords, Level 2 access must be obtained.
NOTE: The SCADA password can be a maximum of 8 digits long. The others may be as long
as 16 digits.
A password can be disabled by setting it to a single zero. The Level 3 password cannot be
changed or disabled.
TIMEOUTS
There are a few timers to reset security access:
SCADA Access timeout, which resets SCADA access completely below the SCADA security level (or the
lowest unprotected level) after 30 seconds without any read/write requests on the SCADA data link.
Level 1, 2, and 3 timeout, which resets the SCADA access level to level 0 (or the lowest unprotected level
above level 0) after 10 minutes without any successful write requests over the SCADA data link. To
prevent this fixed timer from expiring without risking affecting functions of the EMCP 4, writing to the Key
Press (310) register will reset this timer.
Security-related Modbus registers:
Key Press (310)
Write Access Password (700)
Level 1 Password (708)
Level 2 Password (716)
SCADA Password (724) – 8 ASCII digits long; leading zeroes truncated
Current Security Level (732)
Set Security Level (733)
Level 3 Password Phone In Prompt (734)
An example of some of the security features is provided in Chapter 7.
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