Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Manual de usuario descargar pdf (Pagina 180)

Publication AG-UM008C-EN-P - February 2005

4-42 Configuring SLC 5/03, 5/04, and 5/05 Processors

For this example, the MSG Timeout value should be at least

seconds.

Minimum Slave MSG Block Message Timeout

The minimum slave MSG Block Message Timeout should allow for the

Master to go through Message Retries plus one number of maximum

poll scans before timing out. Therefore, the minimum MSG Block

Message Timeout value should be at least (Slave Channel 0 Poll

Timeout) * (Slave channel 0 Message Retries + 1), rounded up to the

next whole second.

Minimum Radio Modem MSG Block Message Timeout

The minimum radio modem MSG Block Message Timeout should

allow for the end-to-end transmission of the command going out and

the reply coming back over the radio modem network, including time

through repeaters and/or store and forward nodes.

Minimum Point-to-Point MSG Block Message Timeout

The minimum point-to-point MSG Block Message Timeout should

allow for the processor to go through Message Retries plus one ACK

time out. Therefore, the minimum MSG Block Message Timeout value

should be at least (ACK Timeout) * (Channel 0 Message Retries + 1),

rounded up to the next whole second.

TIP

Leave the channel 0 Message Retries at default (3)

unless you have an extremely error free or extremely

error prone network.

Minimum Slave MSG Block

Message Timeout

(Slave channel 0 Poll Timeout)*(Slave Channel 0 Message Retries + 1)

TIP

The default MSG Block Message Timeout is 5

seconds but for most radio modem configurations,

this can be reduced to 2 seconds.

Minimum Point-to-Point MSG Block

Message Timeout

(ACK Timeout)*(Channel 0 Message Retries + 1)

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Rockwell-automation DAG6.5.8 APPLICATION GUIDE SCADA SYSTEM Manual de usuario Pagina 180