Notifier Ul: Analog Values And Trending; Analog Value Use Cases - Honeywell CGW-MB Installation And User Manual

NOTIFIER UL: Analog Values and Trending

7.20 NOTIFIER UL: Analog Values and Trending
Trending of analog values is supported on all of the panels/networks 4 – 20 mA modules.
The only limitation is that the CLSS Gateway mainboard will only actively read analog
values for up to 10 analog modules at a time. All the analog values on all the modules can
be read as long as a separate poll is sent for these points in groups of up to 10 points at a
time, following the rules outlined below. Refer to
issue.
• Accept a poll for up to any 10 analog (4–20 mA) points per CLSS Gateway mainboard.
• Requests for more points than this are rejected with an exception code.
• If any of the points in the request are not 4–20 mA modules then the CLSS Gateway
mainboard rejects the request with an exception code.
• The first poll for analog values is an initialization poll. This initialization poll informs the
CLSS Gateway mainboard to start acquiring analog values for these points at 5
second intervals.
• Points are only polled on the NFN if the 4–20 mA module is in at least the first level of
alarm status. If the point is normal then the CLSS Gateway mainboard returns a value
of zero.
NOTE: The first response to an analog point poll is zero. This response is an initialization
confirmation from the CLSS Gateway mainboard.
• Upon receiving the initialization confirmation, the client can begin polling the analog
points. The client should wait 5 seconds after the initialization request to insure that
the CGW-MB has had enough time to get the analog values and load the registers.
Thereafter the CGW-MB continues to poll the points. The analog value in the CGW-MB
are updated no faster than once every 5 seconds.
• Points are polled if the device is in at least the first level of alarm status. Zero is
returned for devices not in alarm status.
• When a point being polled enters normal status, polling for that point on the NFN
is terminated and the analog value register for that point is filled with zeros.
• The CGW-MB ceases polling the analog points when:
• The client does not make a request for these exact same points over a period
defined in the Modbus Configuration Tool as "Analog Value Time Out". The
default is 15 seconds.
• The CLSS Gateway mainboard makes a request for a point (or points) that is not
exactly the same as the initial request. The CGW-MB first sends an initial
confirmation for the new set of analog points, and then begins polling those
points at 5 second intervals.
• When a 4–20 mA module is in fault, the analog value register for that point is filled
with zeros.

Analog Value Use Cases

Use Case 1: A client requests analog values from the points L1M1 through L1M10 every
10 seconds.
Result: The CGW-MB sends back zeros in response to the first request for analog values
from the points L1M1 through L1M10. The CGW-MB sends back actual values on the
second request from the client 5 seconds later. The CGW-MB continues to poll these
devices as long as the client continues to send analog value requests for points L1M1
through L1M10 at a rate faster than the Analog Value Time Out.
Use Case 2: A client requests analog values from the points L1M1 through L1M10. After
10 minutes of polling on a 10 second interval, the client stops requesting analog values
for these points.
Result: The CGW-MB sends back zeros in response to the first request for analog values
from the points L1M1 through L1M10. The CGW-MB sends back actual values on the
second request from the client 10 seconds later. The CGW-MB continues to poll these
CGW-MB Installation and Users' Manual | P/N:LS10248-000HW-E | REV.G | JUL/31/2022
"Analog Value Use Cases"
Modbus Communications
for clarity on this
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