Delta AH500 - Page 290

AH500 Module Manual
8-28
The TCP keepalive period by default is set to 30 seconds. D500 is an initial register in which
statuses of data exchanges are stored. Users can enter MODBUS Advance to alter the initial
register.
 Triggering the reading/writing of data
Users can use the instruction TO in ISPSoft to trigger the reading of data from bit devices/word
devices, and the writing of data into bit devices/word devices. (CR#7, CR#8, CR#17, and
CR#18)
CR#
Attribute
Register name
Description
7 R/W
Triggering the reading
of data through COM1
High byte: Reading data from bit devices
Low byte: Reading data from word devices
0: Not triggering it
1: Triggering it once
2: Always triggering it
17 R/W
Triggering the reading
of data through COM2
High byte: Reading data from bit devices
Low byte: Reading data from word devices
0: Not triggering it
1: Triggering it once
2: Always triggering it
8 R/W
Trigg
ering the writing of
data through COM1
High byte: Writing data into bit devices
Low byte: Writing data into word devices
0: Not triggering it
1: Triggering it once
2: Always triggering it
18 R/W
Triggering the writing of
data through COM2
High byte: Writing data into bit devices
Low byte: Writing data into word devices
0: Not triggering it
1: Triggering it once
2: Always triggering it
If users want to continually trigger the reading of data from word devices, they can write 2 into
CR#7. If users wan to trigger the reading of data from word devices once, they can write 1 into