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Qty of Slave Nodes

Min # of Master Controllers

Ring Cycle Transmission Time

Ring Update Rate

4

1

5 µS

200 KHz

8

1

9 µS

111 KHz

16

1

16 µS

62 KHz

32

2

33 µS

31 KHz

48

3

49 µS

20 KHz

64

4

66 µS

15 KHz

128

8

131 µS

7.63 KHz

256

16

262 µS

3.8 KHz

The specifications for ring speed actually depend upon several factors:

    1. Each master controller is expected to add 1µS of data throughput latency.

    2. Extremely long fiber runs may affect the maximum ring speed.

    3. Ring cycle transmission time is rounded to the nearest higher whole number.

    4. The timings shown in this table are approximate values and are intended to illustrate the maximum performance that a MACRO ring system may achieve.

The above table shows the maximum update rate for a MACRO ring. A typical MACRO installation may operate with a ring rate of approximately 10 KHz. This rate only needs to be changed when then speed of the ring update needs to be faster or the number of nodes used exceeds approximately 52.