Honeywell R0512 manual Excel, For all other controllers equipped with Flash Eproms

EXCEL 50/100/500/600/800	COMMUNICATION
Remote trend buffer size formula	For XD52-FC, XD52-FCS, and XC5210C controller (512 Kbytes of RAM):
	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 memory-equipped modules with a minimum application size of 38 Kbytes,
	there will be 2,064 (1,960 + 104) trend values for front-end A and 104 trend values
	each for front-end B and front-end C.
	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 front-end A Plus 100 trend entries for front-end B Plus 100 trend entries for front-end C

--------------------------------------------------

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 FRONT-END A + 100 PER FRONT-END B + 100 PER FRONT-END C

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 ntralPlantControls/Modem-Interface/MODMFAQ4.DOC

59 EN2B-0092GE51 R0512