GCN1-100 Omron, GCN1-100 Datasheet - Page 117

• Manufacturer Part Number: GCN1-100
• Description: CABLE MULTI I/O 1M
• Manufacturer: Omron

Specifications of GCN1-100

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: GCN1100

Step 2: Evaluating the Configuration with Calculations
3-5
96
Step 2: Evaluating the Configuration with Calculations
Note The explanation above is for the communications power supply only. When a
Proceed with this step if the best location for the power supply cannot be
determined from the graphs. Unlike the graph method used in step 1, the cal-
culation method described in this section does not assume a worst-case
power supply configuration.
In DeviceNet, the maximum permissible voltage drop in one power supply line
(+V or − V) is specified as 5 V based on the specified communications power
supply voltage (24 V DC) and the input voltage of the communications power
supply at each device (11 to 25 V DC). The evaluation in this step is based on
the maximum 5 V voltage drop.
The maximum permissible voltage drop in the whole line is 5 V, with the maxi-
mum permissible voltage drop in the trunk line specified as 4.65 V and the
maximum voltage drop in a branch line specified as 0.35 V.
Understanding the Voltage Drop
The following diagram shows the voltage drop effect due to the cable. In the
DeviceNet network, the voltage drop over a communications cable is 5 V or
less (allowing some extra margin), based on the specifications for the
communications power supply device (24 V DC) and communications power
supply at each node (11 to 25 V DC).
V
V
V
V
In the DeviceNet network, V
The voltage drop in the communications cables is specified as 5 V for a single
power supply line (+V or − V). Of the permissible maximum voltage drop within
the system (5 V), the permissible voltage drop in the trunk line is 4.65 V and
the permissible voltage drop in a branch line is 0.35 V.
single power supply must be used to supply both the communications power
supply and the internal circuit power supply, the maximum voltage drop for a
single power supply line (+V or − V) is just 1 V because the specifications for
the internal circuit power supply are much stricter.
Of the permissible maximum voltage drop for a single power supply line (1 V),
the permissible voltage drop in the trunk line is 0.65 V and the permissible
voltage drop in a branch line is 0.35 V. (Refer to page 97 for details.)
Voltage output at the
communications
power supply device.
A
1
2
B
: Voltage supplied at the communications power supply device. Allow for
: Voltage supplied at each node. Allow an extra margin and take V
: Voltage drop at the power supply cable (+V).
: Voltage drop at the power supply cable ( − V).
ambient variations of the power supply voltage and take V
13 V or greater.
V1
Voltage drop of V
Voltage drop of V
A
≤ 5 V and V
A
B
in the V+ line
in the V − line
B
≤ 5 V.
V2
Voltage supplied
at each node.
1
Section 3-5
to be 23 V.
2
to be