ProSoft Technology PTQ-AFC - Manual (Page 129)

PTQ-AFC ♦ Modicon Quantum Platform Quick Start
Liquid and Gas Flow Computer for Hydrocarbon Products User Manual
ProSoft Technology, Inc. Page 129 of 259
June 23, 2011
6.13 Security (Passwords)
The passwords are intended for interrogation by application software in order to
verify an operator’s authorization to make configuration changes and to view
measurement results. The passwords are resident in the module so that different
operators using different copies of the application software must use the same
password. Passwords cannot be retrieved in "Hard Password" mode. The
password protection is not used by default.
Passwords can be numbers between -32768 and 32767. For example, 1234. A
password of 0 (zero) is interpreted as "No password present".
The module supports two passwords: Write-Enable and Read-Only. Each
password is enabled when you write a non-zero value to the corresponding
register.
Password Holding Register Address Description
Write-Enable 9 Protects the module from write operations from the
AFC Manager
Read-Only 19 Protects the module from read or write operations
from the AFC Manager
The following table shows how the passwords affect the AFC Manager operation
depending on the values that you configure:
Protection Level Read-Only
Password
Write-Enable
Password Read Operation: Requires
Authorization? Write Operation: Requires
Authorization?
No protection Zero Zero No No
Write Protection Zero Non-zero No Yes (Use Write-Enable
password)
Read and Write
Protection Non-zero Zero Yes (Use Read-Only
password) Yes (Use Read Only password)
Read and Write
Protection Non-zero Non-zero Yes (Use Read-Only or
Write-Enable password) Yes (Use Write-Enable
password)
Each port can be assigned to different password protection levels. Refer to the
AFC Manager User Manual for more information about this topic.