Rockwell Automation Publication 1794-UM061B-EN-P - March 2020 17
1794 FLEX I/O Diagnostic Digital Modules Overview Chapter 1
Capabilities of the 1794-IB16D include:
• 61131-2 Type 3 compatible sinking inputs.
• interface with PNP sourcing sensors.
• 10…31.2V DC operating range.
• provides up to 50 mA to power an attached sensor.
• detects for an open wire condition down to 50 A.
You need a dummy resistor to mask the channel diagnostic function for each
unused sensor port. Used sensor ports must have a 50 A minimum current draw
with the input field device in both the on- and off-state.
1794-OB16D Diagnostic Output Module Compatibility
You can use FLEX I/O diagnostic output modules to drive various output
devices. Typical output devices include the following.
•Relays
• Solenoids
•Contactors
•Indicators
• Small motor starters
When you design a system using FLEX I/O diagnostic output modules, you must
consider:
• The output must supply the necessary surge and continuous current for the
output device being used.
• When sizing output loads, check the documentation that is supplied with
the output device for the surge and continuous current needed to operate
the device.
Capabilities of the 1794-OB16D diagnostic output module include:
• sourcing style outputs for loads that are connected to common.
• 10…31.2V DC operating range.
• provides continuous current of 0.5 A maximum (8 A per module),
2.0 mA minimum per output.
• capable of 2 A surge for 50 ms, repeatable every 2 s.
• protection from short circuit and overload.
You need a dummy resistor to mask the channel diagnostic function for each
unused output channel.
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