ICP DAS USA ET-7000 Series User Manual page 141

Appendix D: Modbus Application Notes


For example:
If analog input value of channel 0 (30001) > High Alarm value (40296), the address
00764 is 1, else it is 0.
If analog input Value of channel 0 (30001) < Low Alarm value (40328), the address
00796 is 1, else it is 0.
The address 00764 to 00795 is the High alarm indicator. If a High alarm occurred, the
value of register is 1. In normal condition, it will be 0. The address 00796 to 00827 is
the Low alarm indicator. If a Low alarm occurred, the value of register is 1. In normal
condition, it will be 0.
Latch Alarm
When the Latch Alarm mode is enabled, the register stays latched until the specified
registers are cleared.
For example:
If analog input value of channel 0 (30001) > High Alarm value (40296), the address
00764 is 1, else if analog input value of channel 0 (30001) < Low Alarm value (40328),
the address 00796 is 1.
The address 00764 to 00795 is the High alarm indicator. In normal condition, the value
of register is 0. If a High alarm occurred, the value of register stays 1 until the address
00764 to 00795 is cleared. The address 00796 to 00827 is the Low alarm indicator. In
normal condition, the value of register is 0. If a Low alarm occurred, the value of
register stays 1 until the address 00796 to 00827 is cleared.
The address 00764 to 00795 can be used to clear the High Latch Alarm. The address
00796 to 00827 can be used to clear the Low Latch Alarm.
Configuration via the Web page
Browse to the homepage of the ET-7000, and click the "Modbus I/O Settings" link in the
Configuration Section of the Main Menu tree.
ET-7000 AIO User Manual, Apr. 2009, V1.04, EMH-011-104
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