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24
SPM Flex Gas Detector
Relays
The detector is equipped with three relays� Connect it as shown in this figure�
Figure 16.
Relay configuration
The relays can be wired as normally closed or normally open� It can also be
configured as normally energized or normally de-energized via software�
By default, the relays are set to Alarm 1, Alarm 2, and Instrument Fault�
Modbus
The detector includes a Modbus/TCP server� Multi-word data is presented in
big-endian format, as required by the Modbus standard� For example, 150�0 ppm
is stored as 0x4316 in the low register of the pair and 0x0000 in the high register
of the pair� As another example, the NH3 gas abbreviation would be stored in
registers 40007 to 40011 as shown in this table:
Modbus Holding
Register Number
Description
Value if NH3 selected
40007
Gas Abbr 1of5
0x4E48
40008
Gas Abbr 2of5
0x3300
40009
Gas Abbr 3of5
0x0000
40010
Gas Abbr 4of5
0x0000
40011
Gas Abbr 5of5
0x0000
More information about Modbus can be found at
www.modbus.org
�
24 VDC
-
+
4-20 mA
-
+
Terminals
Relay 1
Terminals
Relay 2
Terminals
Fault
Relay 1
COM
NC
NO
Relay 2
COM
NC
NO
Fault
COM
NC
NO
Summary of Contents for SPM Flex
Page 1: ...SPM Flex Single Point Monitor Gas Detector User Manual ...
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Page 27: ...27 SPM Flex Gas Detector Setup Installation drawing Figure 18 Installation drawing ...
Page 70: ...70 SPM Flex Gas Detector ...
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Page 76: ...SPM Flex Gas Detector User Manual 1998M0845 Revision 07 October 2016 2016 Honeywell Analytics ...
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