Rockwell-automation 56AMXN/B ControlLogix AutoMax Comm Module Manual de usuario descargar pdf (Pagina 68)

Page 68 AutoMax DCSNet /RE RIO Module

Publication number 56AMXN-UM002A-EN-P November 2002

DCS Network Update Time

From the manual for the 57C404B (publication J2-3001-3), the DCS

network update time is given by:

Update time = (DropTime * N) + NewDropTestTime + MessageTime

where

DropTime = the amount of time for a master to send a message and the

slave to respond = 2.99 ms

N = Number of slave drops (physical and virtual)

NewDropTestTime = amount of time for the master to poll an inactive

drop and wait for its response = 2.48 ms assuming no response

MessageTime = amount of time to transfer programming terminal

messages. If the master is sendinga message, this is 2.09 ms. If a slave

is sending a message, this is 3.395 ms.

For example, a network composed of 10 drops which is not messaging

will update each drop with a period of:

UpdateTime = 2.99 * 10 + 2.48 = 32.38 ms

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Rockwell-automation 56AMXN/B ControlLogix AutoMax Comm Module Manual de usuario Pagina 68