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COMMUNICATION EXCEL 50/100/500/600/800
EN2B-0092GE51 R0512 58
Remote Trending (dial-up)
General
Per front-end (XBS, EBI), trend values for a total of 20 data points can be stored
(via dial-up) in the remote trend buffer of the controller to which the modem has
been connected. These 20 data points can come from the controller to which the
modem has been connected, or they can come from various other controllers on
the same C-Bus or L
ONWORKS bus.
Controller Firmware 2.03.xx and Higher
Per front-end (XBS, EBI), trend values for a total of 100 data points can be stored
(via dial-up) in the remote trend buffer of the controller to which the modem has
been connected. These 100 data points can come from the controller to which the
modem has been connected, or they can come from various other controllers on
the same C-Bus or L
ONWORKS bus. Unused application memory can be used as
additional remote trend buffer.
Controller Firmware 2.04.xx and Higher
In combination with the large RAM controllers XD52-FC, XD52-FCS, XC5210C, a
total of 384 KB of additional trend buffer is available. This increase in the trend
buffer size reduces the number of times the controller must dial-up the front-end
and lowers the risk of trend values being overwritten due to a full buffer.
By exploiting this feature, it is possible, when no application is downloaded, to use
the EXCEL controller as a pure trending device.
The amount of additional memory available for the remote trend buffer is deter-
mined by the value for “Application Memory Size” entered with the MMI during the
start-up sequence of the controller. This number is subtracted from the total
application memory, and the resulting number, in Kbytes, is the additional remote
trend buffer size. Fig. 24 illustrates the adjustable remote trend buffer.
REMOTE TREND BUFFER
UNUSED APPLICATION MEMORY
e.g. 58 KB
58 KB
= 1263 ADDITIONAL TREND SAMPLES
+ 100 TREND SAMPLES (DEFAULT)
= 1363 T0TAL TREND SAMPLES
128 KB
TOTAL APPLICATION MEMORY
APPLICATION
e.g. 70 KBYTES
Fig. 24. Adjustable remote trend buffer example
The maximum number of trend values will be displayed on the MMI once a value for
application memory size is entered. The adjustment range for the application
memory size is the following:
Table 22. Adjustment range for application memory size
application memory size trend values in remote trend buffer
maximum (default): 128 Kbyte 42 per front-end
example: 120 Kbyte 100 per front-end
minimum: 38 Kbyte 100 per front-end; PLUS “N” for front-end A