Rockwell-automation 1746-HSCE2 Multi-Channel High Speed Counter Module Manual de usuario descargar pdf (Pagina 74)

Publication 1746-UM002B-EN-P - August 2004

4-24 Configuration and Programming

Transmit Bit

The transmit bit is not used. A programming cycle is not needed to

program these bits. The block is acted upon for every program scan

that bit 07 of word 0 is set. Therefore, a transmit bit is not used.

Programming Block Identification Bit

(Word 0, Bit 07)

This bit identifies the type of block.

Control Words

(Words 1 to 4)

Each counter has its own control word.

In the following programming bits, (n) equals the counter number.

ENn: Enable Counter (n) Bit

(Words 1 to 4, Bit 00)

On power-up or when the EN(n) bit is reset, the counter is in a frozen

state. The counter is free to run when the EN(n) bit is set. All of the

counters must be disabled before transmitting a Module Setup

programming block. The affected counters must be disabled before

transmitting a Counter Configuration programming block. The affected

TIP

If an invalid condition exists, the PERR and ACK

bits are set and all data in the block is considered

invalid.

Table 4.10 Control Word Assignments

Control Words Counter Number

Word 1 Counter 1

Word 2 Counter 2

Word 3 Counter 3

Word 4 Counter 4

1 2 ... 69 70 71 72 73 74 75 76 77 78 79 ... 139 140

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