C500LK009V1 Omron, C500LK009V1 Datasheet - Page 51

• Manufacturer Part Number: C500LK009V1
• Description: PC LINK UNIT
• Manufacturer: Omron

Specifications of C500LK009V1

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

Setting Node Numbers
Network Parameters
Refresh Cycle Time
4-2
Setting Node Numbers
Note Always turn the PC’s power off before setting a Unit’s node number.
Note
Communications cycle
Token cycle
When the control cycle is completed, the polling unit once again sends out
the token, beginning the next token cycle. Together the token cycle and con-
trol cycle make up the communications cycle, and the time required for the
communications cycle is known as the communications cycle time.
The communications cycle time is one of the network parameters. The other net-
work parameters are the number of polled units, maximum number of frames,
and the maximum node number. These parameters are transmitted from the
polling unit to the other nodes in the network. Refer to 4-6 Setting Network
Parameters for details on the network parameters.
Data is refreshed between the SYSMAC LINK Unit and the PC’s CPU Unit while
a data link is active. The PC passes the data for the local words to the SYSMAC
LINK Unit and receives the words written by other nodes from the SYSMAC
LINK Unit. The time required to refresh the data is called the refresh cycle time.
The refresh cycle time can be monitored from Peripheral Devices.
In token bus communications used in the SYSMAC LINK Network, the node
numbers make a logical ring that the token is passed around. The logical ring
of node numbers takes the place of the actual physical ring used in some
other networks. Consequently, proper setting of the node numbers is essen-
tial to network operations.
Node number switches determine the node number. The left switch sets the
tens digit; the right switch sets the ones digit. The node number must be in
the range from 01 through 62. Each SYSMAC LINK Unit in a Network must
have a unique node number.
Use a small flat-blade screwdriver to set node number switches, being care-
ful not to damage them. The following example shows the node number set
to 50.
x10
1. If the node number set on the Unit is outside of the allowed range (01 to 62),
2. Each Unit in the network must have a unique node number, so be sure not to
1
a communications error will occur and the red ERC indicator will light on the
Unit’s display.
use the same number in more than one Unit.
Polling cycle
NODE No.
Communications cycle
Token cycle
x10
0
Polling cycle
Section 4-2
37