Sensoray 720RB - Manual (Page 7)

Sensoray Model 720RB/DIN Instruction Manual Page 5
3 Description
The Model 720RB/DIN Relay Board provides a cost effective opto-coupled interface between the input/output
signals and the system control board using readily available, industry standard, G4 OPTO22 devices. There are a
wide range of OPTO22 devices available giving the system great flexibility.
4 Features
1. Connects 24 OPTO22 I/O modules.
2. Three boards can be chained together to provide up to 72 I/O connections.
3. Easy service replacement of standard G4 OPTO22 devices.
4. Screw terminals for easy field wiring.
5. Available as a DIN rail mounting board or with standoffs.
6. Can be used for input or output signals.
7. OPTO22 I/O modules give a designer a high degree of flexibility.
5 Field Connections
The 720RB/DIN is connected to the control system using a 50-pin header or a 80-pin high density connector.
There are two screw terminals, which are used connect a suitable supply the OPTO22 devices.
There are 24 pairs of I/O screw terminals, two for each OPTO22 device.
There are a further two 50-pin headers used to connect another two 720RB boards giving a total of 72 possible
I/O modules. This connection method is only used when using the 80-pin high-density connector.
The terminal connectors will accept 2,5mm single solid wire or 1,5mm stranded wire with ferrules.
6 Supply
This is determined by the OPTO 22 devices used and the input voltage of the system controller. If for example a
G4 OAC5 is used then the supply would need to be +5V and the system controller needs to be able to
accommodate the 5V input levels that will be caused buy the pull-up resistors.
The supply connector is J3 and is labeled ‘GND’ and ‘VCC’. The ‘GND’ terminal is the system common.
You cannot mix OPTO 22 devices of different supply voltages on the same 720RB board.