CA950-IO Direct pin-to-pin connections between the male 25 contact D
connector on the CA950-IO board to the female 25 contact D
connector on the OC950 (J52) allows use of up to 21 I/O modules
on the I/O mounting rack. This connection is best accomplished
using a DB25 male to female shielded cable with EMI/RFI
metallic hoods.
Note: Recommended cable length is six feet or less.
The OC950 I/O number corresponds to the Mounting Rack
Module Position. For example, inp0/out0 connects to Module
Position 0, inp1/out1 connects to Module Position 1, etc.
Obviously, when a 16 module rack or smaller is used, the number
of I/O is limited by the rack size. A schematic of the CA950-IO
is given at the end of this section.
Inputs OC950 discrete inputs are compatible with all Opto 22 Input
Modules specified to operate with an Output Supply Voltage of 5
Vdc Nominal. These include:
•
G4IDC5
•
G4IDC5B
•
G4IDC5D
•
G4IDC5G
•
G4IDC5K
•
G4IAC5
•
G4IAC5A
Driving the user’s side of these input modules (so that the current
flows in the emitting diode of the opto coupler) provides a low
input to the corresponding OC950 discrete input. This will return
a value of zero for the variable inpX, where X is the discrete
input being used.
3-20 MA950
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