FB3000 RTU Instruction Manual
D301851X012
November 2023
I/O Configuration and Wiring 69
For current mode, the minimum load impedance driven by any AO channel to allow
detection of a short-circuit is 40 ohms. If the load impedance is less than 40 ohms,
the firmware detects a short circuit even though it might not exist. The maximum
load impedance in current mode is 500 ohms.
3.3.2 Digital Outputs (3AODO8/3OTSG8/OUT08)
When a channel on the 8-channel output module is configured as a digital output, it has
the following characteristics:
Internally, the DO acts as a simple contact closure. When 1 (ON) the contact closes,
when 0 (OFF) the contact opens. A simple contact closure conducts current in either
direction.
There is no polarity associated with DO terminals.
When configured as a DO, the DOLO terminal of each DO channel has no connection
to ground. Each DOLO terminal simply connects only to its corresponding DOHI
terminal when the DO is ON, and disconnects from all terminals when the DO is OFF.
If common grounding among DO channels is required, you must configure it
externally to the personality module.
Table 3-9. Digital Output Characteristics
Type
Supported
Characteristics
(DO)
Contact closure by solid state relay
Maximum current of 500mA at 31VDC
Can be configured to fail at last output value
or fail to a fault state.
Guard against overcurrent on the DO channel to avoid damage to the module.
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