Delta AH500 Hardware Operation Manual page 517

A H 5 0 0 H a r d w a r e a n d O p e r a t i o n M a n u a l
The Item 1 window is described below.

Enable
If users want to make the PLC execute the data exchange, they have to select the Enable checkbox. If the
users want to stop the data exchange temporarily, they can leave the Enable checkbox unselected.

IP Address
Users have to type the IP address of the slave to which the PLC will connect in the IP Address box.

The Shortest Update Cycle (ms)
Users have to set the shortest cycle of updating the data exchange. A millisecond is a unit of time. When
the data exchange is executed, it is updated at specific intervals. However, if the data exchange is
prolonged due to network congestion or other reasons, it will be updated according to the actual situation.

Connection Timeout (ms)
Users can set the longest time that is allowed to elapse before the data exchange is executed. A
millisecond is a unit of time. If the data exchange is not executed after the longest time set elapses, a
connection timeout will occur. The PLC still tries to connect to the slave station selected at specific
intervals. Once the PLC connects to the slave station selected, the data exchange will be executed.

Support read/write synchronization (Function code 0x17)
If the slave to which the PLC will connect can complete reading and writing simultaneously (Modbus
function code 0x17), users can select the Support read/write synchronization (Function code 0x17)
checkbox. After the Support read/write synchronization (Function code 0x17) checkbox is selected,
the PLC will read data and write data simultaneously, and the efficiency in exchanging data will increase.

Device Type
Users can select the model of the slave to which the PLC will connect in the Device Type drop-down list
box. They can select a standard Modbus TCP device or a Delta PLC. If they select a Delta PLC, they can
use the registers in the Delta PLC when they set data blocks. When selecting a 3
select Modbus Register Hex from the Remote Start Address (Hex) drop-down list and define a
hexadecimal 4-digit Modbus absolute positon.

Input
Users can set the register in which the data read will be stored in the Local Start Address box. The
register set can only be a D device (not limited to AH500 advanced CPU series: AHCPU501/511/521/531).
The users can set the register whose contents will be read in the Remote Start Address box. The register
and the address which can be set depend on the device type selected in the Device Type drop-down list
box. The users can set the quantity of data which will be read in the Quantity box. For AH500 basic CPU
series (AHCPU500/510/520/530), the unit used depends on the remote register type selected. 100 words
(1600 bits) at most can be read. However, if the slave to which the PLC will connect is an AH500 series
CPU module, 400 words (6400 bits) at most can be read. As for AH500 advanced CPU series
(AHCPU501/511/521/531), users can select the register type according to the requirements.

Output
Users can set the register whose contents will be written in the Local Start Address box. The register set
can only be a D device (not limited to AH500 advanced CPU series: AHCPU501/511/521/531). The users
can set the register into which data will be written in the Remote Start Address box. The register and the
address which can be set depend on the device type selected in the Device Type drop-down list box. The
users can set the quantity of data which will be written in the Quantity box. For AH500 basic CPU series
(AHCPU500/510/520/530), the unit used depends on the remote register type selected. 100 words (1600
bits) at most can be written. However, if the slave to which the PLC will connect is an AH500 series CPU
module, 400 words (6400 bits) at most can be written. As for AH500 advanced CPU series
(AHCPU501/511/521/531), users can select the register type according to the requirements.
When users set a data exchange block, the local register set can only be a word device, and the remote
register set can be a bit device. If the remote register set is a bit device, the device number of the remote
register does not need to end with 0. For example, the remote register set can be D0.3. If the data which
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party device, they can