C500ID501CN Omron, C500ID501CN Datasheet - Page 67

• Manufacturer Part Number: C500ID501CN
• Description: TTL INPUT
• Manufacturer: Omron

Specifications of C500ID501CN

• Leaded Process Compatible: No
• Peak Reflow Compatible (260 C): No
• No. Of Digital Inputs: 32
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

Power Considerations
Grounding
Power Failure
Wiring
54
Power Supply
Power failure
detection signal
CPU voltage (5 V)
Power reset
Run monitor outputs
The Line Ground (LG) terminal is a noise-filtered neutral terminal that does not
normally require grounding. If electrical noise is a problem, however, this termi-
nal should be connected to the Ground (GR) terminal.
To avoid electrical shock, attach a grounded (earth ground) AWG 14 wire (cross-
sectional area: 2 mm
be less than 100 W. Do not use a wire longer than 20 m. Care must be taken,
because ground resistance is affected by environmental conditions such as soil
composition, water content, time of year, and the length of time since the wire
was laid underground.
PC operation may be adversely affected if the ground wire is shared with other
equipment, or if the ground wire is attached to the metal structure of a building.
When using an Expansion I/O Rack, the Rack must also be grounded to the GR
terminal. The same ground can be used for all connections.
A sequential circuit is built into the PC to handle power interruptions. This circuit
prevents malfunctions due to momentary power loss or voltage drops. A timing
diagram for the operation of this circuit is shown below.
The PC ignores all momentary power failures if the interruption lasts no longer
than 10 ms. If the interruption lasts between 10 and 25 ms, the interruption may
or may not be detected. If the supply voltage drops below 85% of the rated volt-
age for longer that 25 ms (less for the DC Power Supply), the PC will stop operat-
ing and the external outputs will be automatically turned OFF. Operation is re-
sumed automatically when the voltage is restored to more than 85% of the rated
value.
The following diagrams show the proper way to connect the power source to the
PC. The terminals marked “NC” are not connected internally.
OFF
Momentary power
failure detection time
2
min.) to the GR terminal. The resistance to ground must
ON
Approx. 1 s
Section 6