Emerson ROC827 Historical Database and Event & Alarm Log, Point vs -Point Addressing

ROC827 Instruction Manual

The difference between 16-point and 8-point addressing becomes critical when you have a host device reading data from specific TLPs. For example, under 16-point addressing, channel 2 for a DI module in slot 2 is referenced by TLP 101,33,3. Under 8-point addressing, channel 2 for a DI module in slot 2 is referenced by TLP 101,17,23. Table 1-2 illustrates the difference between 8-point and 16-point addressing.

Table 1-2. 16-Point vs. 8-Point Addressing

Slot Number	Logicals (16 pt)	Logicals (8 pt)
0	0–15	0–7
1	16–31	8–15
2	32–47	16–23
3	48–63	24–31
4	64–79	32–39
5	80–95	40–47
6	96–111	48–55
7	112–127	56–63
8	128–143	64–71
9	144–159	72–79
10	N/A	80–87
11	N/A	88–95
12	N/A	96–103
13	N/A	104–111
14	N/A	112–119
15	N/A	120–127
16	N/A	128–135
17	N/A	136–143
18	N/A	144–151
19	N/A	152–159
20	N/A	160–167
21	N/A	168–175
22	N/A	176–183
23	N/A	184–191
24	N/A	192–199
25	N/A	200–207
26	N/A	208–215
27	N/A	216–223

Note: 16-point addressing is the default for the ROC800-Series firmware. To maximize the expanded input capabilities of the ROC827, you must use ROCKLINK 800 to modify the firmware addressing to use 8-points per module.

1.4.1 Historical Database and Event & Alarm Log

The historical database provides archiving of measured and calculated values for either on-demand viewing or saving to a file. It provides an historical record in accordance with API Chapter 21.1. You can configure each of up to 200 points in the historical database to archive values under various schemes, such as averaging or accumulating, as appropriate for the type of database point.

Issued Mar-06 General Information 1-11