Mettler Toledo MT User's Guide download pdf (Page 119)

IND780 User’s Guide

Figure 3-50: Load Cell Symmetry Page

Watchdog Monitoring

The main hardware microprocessor of the IND780 has a built-in hardware

watchdog timer that is used to constantly monitor the performance of the measure-

ment channels, weight display, peripheral communications and the discrete I/O

functions. If any one of these functions fails to respond to the watchdog within a

fixed time interval, the watchdog timer will timeout and the entire terminal will

automatically reboot within 40 seconds. Given the seriousness of the system

failure, if feasible the terminal will record the watchdog update failure event in the

error log. Watchdog monitoring allows the terminal to detect certain system failures

and to automatically recover from them.

Master Reset

A hardware master reset switch is provided, that sets all IND780 terminal settings

to the factory default settings (see Appendix B, Default Settings). This includes

scale setup and calibration information, log files (except for the error log) and

counters. The master reset typically is performed under these circumstances:

• When a hardware configuration change is made, such as adding a new scale

or Discrete I/O board to the terminal.

• When a software configuration problem arises that cannot be resolved without

starting from the factory default settings.

• When security is enabled to protect setup, and the password is lost.

• After a firmware upgrade is performed.

• After a hardware key is installed or removed.

Two types of master reset are possible, depending on the position of switch S2

(shown in its OFF position in Figure 3-51): A full reset including metrologically

significant scale configuration data, and a reset that preserves scale data.

To initiate a master reset, perform the following steps:

1. Remove AC power.

2. If the reset is to include scale configuration data, set S2 to its ON position. If

scale configuration data are to be retained, leave S2 OFF.

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Mettler Toledo MT User's Guide Page 119