Delta AH500 Hardware Operation Manual page 484

11.2.1.1 General Specifications and Functions
1. General specifications:
Item
Communication type
Data transfer rate
Communication medium
Maximum transfer distance
Data storage
Number of storage blocks
Size of a storage block
Modules supported
2. Functions:
An Ether Link is a network mechanism through which PLCs can exchange data. If the PLCs in a network
want to perform data exchange, they must be in the same domain. A PLC can read the data in relays, data
registers, and link registers in another PLC, and store the data in relays, data registers, and link registers in
itself. In the figure below, AH1 reads the data in three storage blocks in AH2. The maximum size of a
storage block is 1900 words. (The maximum size of a storage block can not exceed the device range.) The
number of storage blocks which are read in a PLC plus the number of storage blocks that the PLC reads is
no more than 128.

Flexible control
There are three start modes.
(1) Always Run: When the PLC runs, data exchange is performed.
(2) Always Stop: During the operation of the PLC, no data exchange is performed.
(3) SM Flag: The performance of data exchange depends on a special auxiliary relay in the PLC.
Users can set the start mode of an Ethernet port. They can operate an Ethernet port flexibly.

Simple setting
Users can construct an Ether Link and a PLC Link by means of NWCONFIG in ISPSoft. After users
create a network framework in NWCONFIG, they can create a data exchange table. Users can add
devices and storage blocks which are involved in data exchange according to the actual framework.
The setting can be downloaded to a PLC by the software. Users do not have to memorize registers.

Elimination of errors
The execution of an Ether Link can be monitored by ISPSoft. Users can know the operating status of a
PLC. The ports on a PLC and the storage blocks involved in data exchange are displayed. Besides,
the error log displayed helps users eliminate errors.
Specifications
Distribution
100 Mbps
Category 5 shielded cable
100 meters
Relays (A word is taken as a unit.), data registers, and link
registers
Maximum of 128 blocks
Maximum of 1900 words
AHCPU530-EN, AH10EN-5A
AH1
M
D
L
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
AH2
M
D
L
11 - 3 5