Operation Page 5-
while the "In" group represent the status inputs that are read
back. The two groups allow the user to determine if a bit is
active due to internal or external control.
When an output is activated, the bit in the "Out" group will
indicate "1" immediately, but the corresponding "In" bit may
take a second or two to reflect the change. For the Internal
Control Outputs, if an "Out" bit is active (1) but the "In" bit
is not active after a second or two, a problem with that output
is indicated. This is also true for the User Digital I/O Bits,
however when an output is inactive (0), the corresponding input
bit can indicate either a 1 (active) or 0 (inactive), depending
upon the external status that is applied to the inputs.
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