Rockwell-automation AutoMax ControlNet Communication Interface Module Manual de usuario descargar pdf (Pagina 57)

AutoMax ControlNet Module Page 57

Publication number DSMBCN-UM001B-EN-P February 2003

Viewing Network Parameters

The network parameters include the network update time (NUT), the

maximum scheduled address (SMAX), the maximum unscheduled

address (UMAX), and the network redundancy (channel A only, Channel

B only, or both).

There are additional network parameters that depend on the devices on

the network, the network media type and length, and so on.

The MBCN has tables that contain the values assigned. Refer to the

ControlNet specification for detailed information on what these registers

contain.

In normal operation, it will not be necessary to use these registers.

Current Network Parameters

An application can use the following registers to view the current

network parameters. These registers should be regarded as read-only.

NOTE: The active network keeper periodically sends a packet called the

TUI that indicates the status of the network keeper to the other nodes on

the network.

Name Register Description

CurNutLen 9304

Network update time (NUT) in 10 µs

increments

CurSMax 9305 Maximum scheduled address. This is

the highest address allowed to

transmit scheduled data.

CurUMax 9306 Maximum unscheduled address. This

is the highest address allowed to

transmit unscheduled data.

CurSlotTime 9307 Slot Time. This is the maximum time

to wait for a node to transmit (in 1 µs

ticks)

CurBlanking 9308 Minimum gap between frames (in 1.6

µs ticks) (always 6)

CurGbStart 9309

Guard Band Start Time (in 10 µs ticks)

CurGbCenter 9310

Guard Band Center Time (in 10 µs

ticks). This is when the moderator

node sends the moderator packet.

CurModulus 9312 Modulus (always 127). This is different

from the scheduling modulus.

CurGbPrestart 9313

Guard Band PreStart Time (in 10 µs

ticks)

1 2 ... 52 53 54 55 56 57 58 59 60 61 62 ... 79 80

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