Rockwell-automation 1734-485ASC POINT I/O ASCII User Manual Uživatelský manuál stáhnout pdf (Strana 67)

Publication 1734-UM009B-EN-P - July 2003

Using the ASCII Modules with the ControlLogix System Application Examples B-7

The ladder logic below increments a counter every 8 seconds and

then copies the accumulator value of the counter into the transaction

ID location Local:1:O.Data[1]. When the counter reaches 255, it is

automatically wrapped around to 0.

In the output table below, the data being transmitted is already inside

the data table starting at Local:1:O.Data[4] and a constant length of 9 is

in Local:1:O.Data[3]. Under normal conditions, the transmit data and

length would be loaded by the ladder program prior to incrementing

the transaction ID.

1 2 ... 62 63 64 65 66 67 68 69 70 71 72 ... 75 76

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Rockwell-automation 1734-485ASC POINT I/O ASCII User Manual Uživatelský manuál Strana 67