Page 58 - GuardII+ Series 4208 Platform SM User Manual

Appendix

8.2. Modbus Register Map

GuardII+ hosts Modbus data registers that can be used by external devices to access the
SM results of the most recent set of measurements directly from a plant control system on the
same network. This section describes the data registers hosted by the monitor.

NOTE:
The GuardII+ Modbus register map is designed for compatibility with
Modbus Application Protocol Specification v1.1b3.

8.2.1. General Modbus Register Information

• Each register is an F03 Holding Register
• Unless otherwise noted, all data is expressed as 16-bit unsigned values
• For values that are expressed as float data type, they are encoded as CD AB (or word-
swapped) floats.
• To access the data registers, connect to the GuardII+’s Ethernet address and read the
desired register using the Modus over TCP/IP protocol
For those that have worked with the older GuardII+ continuous monitor, the Modbus
registers for the GuardII+ Series 4208 Platform are the same as the SM Modbus registers for
the original monitor, with the following exceptions:
• A set of Overall Status addresses have been added.

8.2.2. GuardII+ Overall Status Modbus Data

These Modbus addresses are common to all GuardII+ monitors regardless of the
monitoring technologies that are installed. This data is updated after every diagnostic cycle
and when the Alert state changes. For a monitoring technology that is not installed, the Alert
status of that technology will always be reported as ‘no Alert’.

Address Alert Notes
64000 Year The year of the last update
Expressed in 4 digits (i.e., 2019)
64001 Month The month of the last update
1 = January … 12 = December
64002 Day The day of the month of the last update
64003 Hour The hour of the last update
Expressed in 24-hour mode (0-23)
64004 Minute The minute of the last update
0-59
64005 Second The second of the last update
0-59
64006 Diagnostic Status The current diagnostic state of the monitor.
0 = OK
1 = Error detected

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