Rockwell-automation 61C613 16 Channel Analog Input Module Manual do Utilizador descarregar pdf (Página 23)

4Ć7

The data returned is a signed integer. Location (M+1) is the least

significant byte, and location (M+2) is the most significant byte.

Depending upon how the channel was configured and the

temperature readĆout units selected (refer to section 4.2.2), the units

are either millivolts, degrees C, or degrees F.

4.2.9 Read Analog Input on Demand

The command to convert and read an analog input value on demand

will require between 45Ć110 milliĆseconds to execute, depending on

how the channel was configured. The command contains the

following information:

Location (M+0) 25

Location (M+1) channel number

Location (M+2) 0

Valid channel numbers range from 0 to 15, corresponding to channel

numbers 0Ć15.

The data returned is a signed integer. Location (M+1) is the least

significant byte. Location (M+2) is the most significant byte. The units

are either millivolts, degrees C, or degrees F, depending on how the

channel was configured and the temperature readĆout units selected.

The units will also include any slope and offset specified for the

channel.

4.3 Programming Examples

This section describes some simple programming examples for the

61C613, using write commands and read commands.

4.3.1 Writing Commands with the DCS 5000/AutoMax

The following example is a DCS/AutoMax BASIC subroutine that will

write a command to the module. This subroutine is written under the

assumption that the command can be executed in a maximum of 33

milliĆseconds.

15981 REM

15982 REM Write Commands to A/D

15983 REM

15984 REM Inputs:

15985 REM ąM! = hex address of module (02X0000H), X = slot

15986 REM ąOPCODE% = byte value written to (M+0)

15987 REM ąLS_BYTE% = byte value written to (M+1)

15988 REM ąMS_BYTE% = byte value written to (M+2)

15989 REM

15990 REM Output:

15991 REM ąERR_CODE%=0ifnormal; nonĆzero if error

15992 REM

15999 REM

16000 IOWRITE( 1, OPCODE%, M!+0)

16010 IOWRITE( 1, LS_BYTE%, M!+1)

16020 IOWRITE( 1, MS_BYTE%, M!+2)

16100 FOR I%=1TO3

16110 ąDELAY 2 TICKS

16120 ąSTATUS% = IOREAD%( 1, M!+3)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 51 52

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