EXCEL 50/100/500/600/800 | COMMUNICATION |
Remote trend buffer size formula | For |
| N = (128 Kbytes - appl. size (in Kbytes) + 384 Kbytes) * 1024 bytes / 47 bytes |
| For all other controllers equipped with Flash EPROMS: |
| N = (128 Kbytes - appl. size (in Kbytes)) * 1024 bytes / 47 bytes |
| Hence, the maximum value of N is 10,327 trend values for large RAM controllers |
| and 1,960 trend values for all others containing Flash memory. This means that for |
| all Flash |
| there will be 2,064 (1,960 + 104) trend values for |
| each for |
| If an application being downloaded exceeds the application memory size, a warning |
| message will be displayed on the MMI, and the download will not be executed. |
Excel 800
Excel 800 controllers provide a reserved Remote Trend Memory of 60Kbytes, which allows a total of 2591 trend entries to be stored – see also diagram below:
2391 trend entries for
TOTAL = 2591 trend entries
160 KBYTES
TOTAL APPLICATION MEMORY
REMOTE TREND MEMORY:
60 KBYTES = 2501 TREND ENTRIES
APPLICATION (excluding RACL)
= max. 100 KBYTES
REMOTE TREND BUFFER
60 KBYTES
=2591 TREND ENTRIES
=2391 PER
Fig. 25. Adjustable remote trend buffer example (Excel 800)
Unused application memory can be used for storing additional remote trend entries. In order to do so, the adjustment range for the application memory size is the following.
Table 23. Adjustment range of application memory size
application memory size | trend values in remote trend buffer |
maximum (default): 100 Kbyte | 2501 |
example: 80 Kbyte | 2936 |
minimum: 38 Kbyte | 3851 |
|
|
MODEMFAQ
Detailed information and guidance can be obtained from the MODEMFAQ document, which can be found on the following servers:
http://web.ge51.honeywell.de/dep/mc/HVAC_Products/Automation_and_Control/Ce
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