ICP DAS USA ET-7000 series, User Manual

Page: 141 / 148

Appendix D: Modbus Application Notes
ET-7000 AIO User Manual, Apr. 2009, V1.04, EMH-011-104
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141
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.
z
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.