DMC-40x0 Command Reference CO • 69
CO
FUNCTION: Configure Extended I/O
DESCRIPTION:
The CO command configures which points are inputs and which are outputs on the extended I/O.
The 32 extended I/O points of the controller can be configured in banks of 8. The extended I/O is
denoted as bits 17-48 and banks 2-5.
ARGUMENTS: CO n where
n is a decimal value which represents a binary number. Each bit of the binary number represents
one bank of extended I/O. When set to 1, the corresponding bank is configured as an output.
The least significant bit represents bank 2 and the most significant bit represents bank 5. The
decimal value can be calculated by the following formula.
n = n
2
+ 2*n
3
+ 4*n
4
+ 8*n
5
where n
x
represents the bank. To configure a bank as outputs, substitute a one into that n
x
in the
formula. If the n
x
value is a zero, then the bank of 8 I/O points will be configured as inputs.
For example, if banks 3 and 4 are to be configured as outputs, CO 6 is issued.
USAGE: DEFAULTS:
While Moving Yes Default Value -
In a Program Yes Default Format -
Command Line Yes
Controller Usage
ALL
OPERAND USAGE:
_CO returns extended I/O configuration value
RELATED COMMANDS:
CB Clear Output Bit
SB Set Output Bit
OP Set Output Port
777TI Tell Inputs
EXAMPLES:
CO 15 Configure all points as outputs
CO 0 Configure all points as inputs
CO 1 Configures bank 2 as outputs on extended I/O
Hint: See user manual appendix for more information on the extended I/O board.
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