VXi VT1422A 사용자 설명서

In the Algorithm Language, channels are referenced as pre-defined variable 
identifiers. Because input channels could be from Remote Signal 
Conditioning Units (RSCUs), there are two forms of input channel syntax. 
The general on-board input channel identifier syntax is "I1cc" where cc is a 
channel number from 00 (channel 0) through 63 (channel 63). The Remote 
input channel syntax is "I1ccrr" where cc is the SCP channel number (one 
of 00, 01, 08, 09, 16, 17, 24, 25, 32, 33, 40, 41, 48, 49, 56, or 57) and rr is 
the channel (0 through 31) on the RSCU see the heading "Remote Channels" 
on page 231 for more information. 

For output channels, the syntax is "O1cc," where cc is a channel number 
from 00 (channel 0) through 63 (channel 63). Like all VT1422A variables, 
channel identifier variables always contain 32-bit floating point values even 
when the channel is part of a digital I/O SCP. If the digital I/O SCP has 8-bit 
channels (like the VT1533A), the channel's identifiers (O1cc and I1cc) can 
take on the values 0 through 255. To access individual bit values, ".Bn" may 
be appended to the normal channel syntax; where n is the bit number (0 
through 7). If the Digital I/O SCP has single-bit channels (like the 
VT1534A), its channel identifiers can only take on the values 0 and 1. 
Examples:

O100 = 1;

Inp_val = I108;

Bit_4 = I109.B4;

Output channels can appear on either or both sides of an assignment 
operator. They can appear anywhere other variables can appear. Examples:

O100 = 12.5;

O108.B4 = ! O108.B4;

writecvt(O116,350);