Rockwell-automation 61C350 2-In/2-Out 0-10 Volt Analog Rail Module Manual de usuario descargar pdf (Pagina 30)

4Ć8

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In Local Head mode, the module is imaged in four I/O registers of

the processor. Data from all four channels is always available and

will be updated at the end of each scan. For input channels, it is not

necessary to select the channel. After the I/O update, the register

contains the data in the format shown in figure 4.9. For output

channels, the data in the register must be in the format shown in

figure 4.10 prior to the I/O update.

17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0Octal

12 bits of converted analog data

overĆrange (1=overĆrange)

underĆrange (1=underĆrange)

not used

Figure 4.9 Ć Local Head Register Image for Input Channels

17 16 15 14 13 12 11 10 7 6 5 4 3 2 1 0Octal

12 bits of analog output data

not used

Figure 4.10 Ć Local Head Register Image for Output Channels

The Analog Rail module data may also be accessed in the middle of

the scan (as opposed to the end of the scan) using the appropriate

number of Analog In (AIN) and Analog Out (AOUT) blocks. The AIN

block will set the overĆrange or underĆrange bits if applicable. See

section 4.1.4 for more information about the AIN and AOUT blocks.

Note that the AIN and AOUT blocks are supported by the AutoMate

20E M/N 45C224 and 45C225, but not the AutoMate 20 (M/N 45C20,

45C21, 45C220, 45C221) by APX Version 3.0.

For processors that do not support the AIN and AOUT blocks, you

can use the MOVE block to move data in and out of the registers

assigned. OverĆrange and underĆrange bits should be used as

inputs to error coils. The I/O update will occur automatically at the

end of each scan. See Appendix C for a sample AutoMate program

that writes to and reads from the Analog Rail module without using

AIN and AOUT blocks.

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Rockwell-automation 61C350 2-In/2-Out 0-10 Volt Analog Rail Module Manual de usuario Pagina 30