Rockwell-automation 1794-IP4 Series B FLEX I/O PULSE COUNTER User Manu Manual de usuario descargar pdf (Pagina 48)

5–3How Communication Takes Place and I/O Image Table Mapping with the DeviceNet Adapter

     

System throughput, from Pulse Counter to backplane, is a function

of:

• the configured minimum frequency sample time

• the number of channels actually configured for connection to a

specific sensor (0 or 1)

You can set the minimum frequency time during module

configuration. The selection influences the sample data rate, thus

affecting system throughput.

The number of channels included in each input scan also affects

system throughput.

FLEX I/O Pulse Counter module data table mapping is shown

below.

Pulse Counter Module (1794ĆIP4) Image Table Mapping

Module Image

I/O Image

Input Size

Output Size

   

   

Counter 00 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 0

Code for identification of software version

Control Word 0 - Sets the measure function

Control Word 2 - sets the start of a new measurement

Control Word 1 - Sets the clock frequency and period multiple

Counter 01 - pulse counter for channel 0 or high word of 32Ćbit period measurement

Counter 10 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 1

Counter 11 - pulse counter for channel 1 or high word of 32Ćbit period measurement

Counter 20 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 2

Counter 21 - pulse counter for channel 2 or high word of 32Ćbit period measurement

Counter 30 - 16-bit period measurement or low word of 32Ćbit period measurement for channel 3

Counter 31 - pulse counter for channel 3 or high word of 32Ćbit period measurement

Readback of Control word 2 or

Reserved M0M1M2M3

Reserved

RD0RD1RD2RD3

System Throughput

Mapping Data into the

Image Table

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 70 71

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Rockwell-automation 1794-IP4 Series B FLEX I/O PULSE COUNTER User Manu Manual de usuario Pagina 48