Sensoray 720RB - Manual (Page 8)

Sensoray Model 720RB/DIN Instruction Manual Page 6
7 I/O Configuration
When used in this configuration the board is usually connected to the control system using a 50 way ribbon cable
connecting to 50 pin header (JP1).
Figure 1 Connectors
JP1 will accept a standard .100” dual row IDC ribbon cable connector.
The 80 pin high density connector (J4) can also be used but only IO0-IO23 will be connected. (Refer to Figure 8
J4 Pin-out page 11)
There is a 4K7 pull-up resistor on each I/O pin. This resistor pulls up to the OPTO22 supply voltage and ensures
that the control systems input pin does not float.
OPTO 22 devices of the same supply voltage can be mixed in any order on the 720RB board. Take care that an
input OPTO 22 device is not used on an I/O line that has been assigned as an output on the control system as this
could cause damage to the control system or the OPTO 22 device.
Also take care when selecting the OPTO 22 operating voltage. Generally this is chosen to be the same as the
control systems input voltage level.