Delta Electronics AH500 Operation Manual page 429

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
will be read or written is not composed of words, the local PLC will exchange bits with the remote PLC
selected, and the bits which are not involved in the data exchange will remain unchanged. For example, if
D0~D1 in the local PLC read M0~M19 in the remote PLC selected, the data read will be stored in
D0.0~D1.3, and D1.4~D1.5 will remain unchanged. As for AH500 advanced CPU series
(AHCPU501/511/521/531), users can select the register type according to the requirements.
After the users set a data exchange block, they have to click OK. The users can use this method to create
several data exchange blocks.
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
rd
party device, they can
11 - 8 5