Rockwell-automation 1769-SM2 Compact I/O DSI/Modbus Communication Modu Manual de usuario descargar pdf (Pagina 57)

Configuring the Module 3-19

Figure 3.20 Example RTU Tx Delay HIM Screen for CH1 Drives

2. Reset the module (see Resetting the Module on page 3-20).

Setting the RTU Message Timeout

1. Set the values of Parameters 18 - [RTU MsgTimeout 1], 33- [RTU

MsgTimeout 2], and 48 - [RTU MsgTimeout 3] to establish the

amount of time that the module will wait for a response from the

respective channel’s drives.

Figure 3.21 Example RTU MsgTimeout HIM Screen for CH1 Drives

Important: The RTU Message Timeout value must be considered

when determining the timeout values in the slave nodes.

For example, if five RTU messages are being sent to a

slave node and the slave is powered down, the overall

network cycle time can increase by as much as 10

seconds (5 messages x 2 seconds timeout for each slave

node).

2. Reset the module (see Resetting the Module

on page 3-20).

Default: 0 milliseconds

Minimum: 0 milliseconds

Maximum: 500 milliseconds

RTU Tx Delay 1

Parameter: #

017

VALUE LIMITS SEL 

TIP: If the Modbus RTU slave is a PowerFlex 4-Class drive, set the

value of [RTU Tx Delay x] to 8 milliseconds when the value of

[RTU Baud Rate x] is 19200.

Default: 2 seconds

Minimum: 0 seconds

Maximum: 60 seconds

RTU MsgTimeout 1

Parameter: #

018

VALUE LIMITS SEL 

TIP: When configured for RTU Master operation, the RTU Slave

addresses do not get assigned with parameter values. The Slave

address is contained in the message data as described in Chapter

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Rockwell-automation 1769-SM2 Compact I/O DSI/Modbus Communication Modu Manual de usuario Pagina 57