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Functions Common to All Slave Units Section 6-1
6-1-5 Power Short-circuit Detection (Input)
Description This function monitors the sensor power supply current. If the current is
50 mA or higher per input contact, a power short-circuit is detected.
The Slave Unit I/O indicator can be used to check whether a power short-cir-
cuit has been detected. When a power short-circuit is detected, a flag in a sta-
tus area in the Slave Unit turns ON to notify the Master Unit. The notification
details can be read using explicit messages. When the cause of the short-cir-
cuit is removed, the Slave Unit is automatically reset, and the power output to
the connector that had the short-circuit is turned ON again.
Setting Using the
Status Areas
Refer to bit 4 in 4-1-1 Generic Status Area and to 4-1-2 I/O Status Area.
6-1-6 Load Short-circuit Detection (Output)
Description This function monitors the load current for the output section and detects an
load short-circuit if the current per contact (or common) exceeds a specific
value. When a load short-circuit is detected, all Unit outputs are turned OFF to
prevent damage to the Unit's output circuits.
The I/O power for the Unit turns OFF if a short-circuit is detected for even just
one of the contacts being used.
When a load short-circuit is detected, a flag in a status area in the Slave Unit
turns ON to notify the Master Unit. The notification details can be read using
explicit messages.
When the cause of the short-circuit is removed, the Slave Unit is automatically
reset, and the power output to the connector for which the short-circuit was
detected is turned ON again.
Checking Using the
Status Areas
Refer to bit 4 in 4-1-1 Generic Status Area and to 4-1-2 I/O Status Area.
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