Table 10: Alarm Configuration Parameter Table - Sensor Electronics SEC Millenium Series Instruction And Operation Manual

Table 10: Alarm Configuration Parameter Table

Bit Field
Bit 0
Bit 1
Bit 2
Bit 3
Bit 4
Bit 5
Bit 6
Bit 7
Bit 8
Bit 9
Bit 10
Bit 11
Bit 12
Bit 13
Bit 14
Bit 15
Read Holding Registers Query
The query message specifies the starting register and quantity of registers to be
read. SEC 3120 internal registers are addressed starting at zero: Modbus holding registers
1–16 are addressed as 0–15.
Multiple sensors are allowed to be attached to a single 3120 unit; therefore the
register map is split into regions as shown previously in Table 1. Each sensor has its own
region (a repetition of the same parameter registers that address each specific sensor's
parameters), and each region is a multiple of 100, as expressed by its sensor number (i.e.
sensor 1 - region 1, or internal register 21xx, sensor 2 - region 2, or internal register
22xx).
Region 0 is reserved for write-only for applying changes to all sensors, therefore
Region 0 (internal registers 20xx) cannot be read.
Region 9 is reserved for SEC 3120 unit level information rather than sensor
specific information. Region 9 (internal registers 29xx) can be read. The maximum
number of sensors that may be attached to the transmitter can be queried from internal
registers 2921. This will allow the master to determine if the other regions apply (region
0, 2-8) if it returns a one indicating that it is an SEC 3100MB16 device, or an advanced
transmitter such as the SEC 3120 (returning two or more).
Note: An SEC 3120 configure as "Single Sensor" mode, will return a one
indicating that only regions 1 and 9 are accessible- requests to read regions outside of this
range (2 - 8 or 0) will generate exception 2 messages.
SEC 3120 16-bit Modbus Manual
For Version 1.2 and above
Low alarm relay normally energized (1) or not (0).
Low alarm relay latching mode enabled (1) or not (0).
Low alarm relay audible alarm mode enabled (2) or not (0).
Low alarm on when gas is above low set point (1) or below (0).
Mid alarm relay normally energized (1) or not (0).
Mid alarm relay latching mode enabled (1) or not (0).
Mid alarm relay audible alarm mode enabled (2) or not (0).
Mid alarm on when gas is above mid set point (1) or below (0).
High alarm relay normally energized (1) or not (0).
High alarm relay latching mode enabled (1) or not (0).
High alarm relay audible alarm mode enabled (2) or not (0).
High alarm on w/gas above high set point (1) or below (0).
Fault alarm relay normally energized (1) or not (0).
Fault alarm relay latching mode enabled (1) or not (0).
Fault alarm relay audible alarm mode enabled (2) or not (0).
Fault alarm on when fault code for sensor non-zero (always 0).
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December 2012
Description
Sensor Electronics Corporation
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