Delta Electronics AH500 Operation Manual page 428

A H 5 0 0 O p e r a t i o n M a n u a l
Owing to the fact that no data is set, there is a blank table in the Data Exchange Setup section. After Add is
clicked, an item will be inserted. After the item is double-clicked, the Item 1 window will appear.
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
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