Ether Link (For Ahcpu5X0 Models); Introduction Of An Ether Link - Delta Electronics AH500 Operation Manual

3. Descriptions of the special data registers SR1329~SR1338:
Device
SR1332 Remote backplane ID
SR1333 Remote slot ID
Extension communication
SR1334
port number
SR1335 Cycle of a PLC Link
Number of slave stations
SR1336
connected
Time for which data has
SR1337 been exchanged by
means of a PLC link
Restricted time of the PLC
SR1338 link which is defined by
users

11.2 Ether Link (for AHCPU5X0 models)

This function is applicable for AH500 basic CPU module series (AHCPU500/510/520/530).

11.2.1 Introduction of an Ether Link

An Ether Link is a network mechanism for data exchange performed through an Ethernet connection. If there
are several nodes in an Ethernet network, users can create a mechanism for data exchange in the network,
and select a start mode. If the parameters which are set are downloaded to the PLCs in the network, the
systems of the PLCs perform data exchange according to the start mode selected when the PLCs run. The
users do not have to write a redundant program. Besides, only AH500 series CPU modules support Ether
Links.
A PLC Link is a master/slave model. There is only one master station in an RS-485 network, and the other
stations which are slave stations passively receive reading/writing commands from the master station.
Compared with a PLC Link, an Ether Link adopts a safer data request mechanism. It is the data demanding
nodes in an Ethernet network that execute an Ether Link.
An Ether Link is not a master/slave model. It allows a node to send reading commands which ask for data to
other nodes. The nodes will send the data to the node after they receive the reading commands. Owing to the
fact that a node can not send writing commands to other nodes, the use of an Ether Link is safer than the use of
Name R/W
The value in SR1332 indicates the remote backplane
R/W on which the RTU module used is installed. The value
in SR1332 must be in the range of 1 to 8.
The value in SR1333 indicates the remote slot in
R/W which the RTU module used is installed. The value in
SR1333 must be in the range of 0 to 7.
The value in SR1334 indicates the communication
R/W
port used. The value in SR1334 must be 1 or 2.
The value in SR1335 indicates the time it takes for the
master station to detect all the slave stations. (Time
unit: 1 millisecond)
The value in SR1335 will be 0 if one of the following
conditions occurs.
R 1. The master station is turned from OFF to ON.
2. The master station begins to runs, or stops running.
3. The master station finishes detecting all the slave
The value in SR1335 will remain unchanged if the
function of enabling a PLC Link is disabled.
Users can not set SR1336. The can only view the
value in SR1336. Whenever a PLC Link is executed,
R
the slave stations connected to the master station are
count.
The value in SR1337 indicates the number of times the
master station exchanges data with all the slave
stations. SR1337 can be used only if SM1587 is ON. If
the execution of a PLC link stops, the value in SR1337
R will not disappear. If the execution of a PLC link in the
manual mode stops, the value in SR1337 will not
disappear. If the value in SR1337 becomes the same
as the value in SR1338, the execution of the PLC link
in the manual mode will stop.
Users can set the number of times the master station
exchange data with all the slave stations.
R/W The value in SR1338 must be in the range of 1 to
65535. If the value in SR1338 is not in the range, it will
not be changed automatically.
C h a p t e r 11 C o n v e n i e n t F u n c t i o n s
Description
stations for the first time.
11 - 3 3