Rockwell Automation 61C613 16 Channel Analog Input Module - Manual (Page 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% = 0 if normal; 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% = 1 TO 3
16110 ąDELAY 2 TICKS
16120 ąSTATUS% = IOREAD%( 1, M!+3)