Manual

Chapter 6
Discrete I/O
6-8
clrbit
Use this routine to write a zero bit into the output image table.
Calling sequence:
clrbit(rack, gr oup, bit );
Arguments:
rack: an integer 0 to 7, the logical rack number.
group: an integer 0 to 7, the module group number.
bit: an integer 0 to 15 (decimal) or 0 to 17 (octal), the bit number.
Returned values:
none.
Note: clrbit is a macro that compiles into a call on putbit with a
constant data value of 0.
putbyte
Use this routine to write an 8-bit byte to the output image table.
Calling sequence:
putbyte(data, rack, gr oup, hilow );
Arguments:
data: an unsigned integer whose low order byte is written to the output
image table.
rack: an integer 0 to 7, the logical rack number.
group: an integer 0 to 7, the module group number.
hilow: the logical constant HI (1) or LO (0) to select the high or low
byte. The high byte is slot 1 (terminals 17-10) of the module group; the
low byte is slot 0 (terminals 07-00).
Returned values:
none.