Appendices

Chapter 8

 

 

 

8-3 CompoBus/D Communications Response Time

This section describes communications response time when OMRON Master and Slave Units are be- ing used. Use this section for reference when planning I/O timing. The equations provided here are valid under the following conditions:

The Master Unit is operating with the scan list enabled.

All of the required Slaves are participating in communications.

No errors are being indicated at the Master Unit

Messages are not being produced in the network (from another company’s configurator, for example).

HCommunications Cycle Time

DOne Master in Network

The following equations show the communications cycle time (TRM) when there is only one Master in the network. If the calculation result is less than 2 ms, the communications cycle time (TRM) will be con- sidered as 2 ms.

TRM = Σ (0.016 TB SOUT1 + 0.11 TB + 0.07)

+Σ (0.016 TB SIN1 + 0.06 TB + 0.05)

+Σ {0.016 TB (SOUT2 + SIN2) + 0.11 TB + 0.07}

+0.11 TB + 0.65

+0.22 TB (number of message nodes)

SOUT1 : The number of Output Slave output words

SIN1 : The number of Input Slave input words

SOUT2 : The number of Mixed I/O Slave output words

SIN2 : The number of Mixed I/O Slave input words

TB : The baud rate factor

(500 kbps: TB = 2; 250 kbps: TB = 4; 125 kbps: TB = 8) (Varies depending on the baud rate)

DMore than One Master in Network

Calculate the communications cycle time according to the above equation for the Slaves of each Master Unit. The communications cycle time for the entire network is the sum of communications cycle times for each Master Unit.

8-11

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Omron 3G3FV-PDRT1-SIN user manual CompoBus/D Communications Response Time, Communications Cycle Time, One Master in Network

3G3FV-PDRT1-SIN specifications

The Omron 3G3FV-PDRT1-SIN is a highly sophisticated variable frequency drive (VFD) designed to enhance energy efficiency and drive performance in various industrial applications. This particular model is part of the Omron 3G3FV series, which is well-regarded for its reliability, versatility, and ease of use.

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