Delta AS Series Programming Manual page 919

AS Ser ies Pro gra mm in g M anu al
Function
code
16#06
16#0F
16#10
7. There is no limitation on the number of times you can use this instruction; however only one instruction can be
executed on the same COM port at a time. You need to decide and use the sending flag for the COM to be used
before executing this instruction. Otherwise, the data from 2 different communication COMs may be mixed up.
8. If a communication timeout occurs, the timeout flags are ON. After you solve the problem, you must reset timeout
flags to OFF. When using this instruction, the timeout value cannot 0. Set the value between 100–32767ms; when
the value is set to 0, it is processed as 200 ms.
9. In Modbus ASCII mode, you need to set up only the data (non-ASCII mode) for transmission. The instruction converts
the non-ASCII mode to the ASCII mode, consisting of the head code (:), the converted ASCII code, checksum (LRC)
and tail code (CRLF). The instruction stores the data received in ASCII character in the internal register. The PLC
_6
automatically converts the data into the hexadecimal value, and if the communication data is correct, stores the
conversion result in S. and sets the completion flag SM to ON.
10. In Modbus RTU mode, you need to set up only the data for transmission. The instruction adds the checksum (CRC)
and the stores the data received in ASCII character in the internal register. The PLC automatically converts the data
into the hexadecimal value, and if the communication data is correct, stores the conversion result stored in S.
11. The instruction cannot be used in the ST programming language, interrupt tasks or function block which is called
only once.
Communication protocol setup example
1. The following examples use PLC communication port 1 and special registers to demonstrate how to setup a
communication protocol.
2. You can set up the PLC communication port with HWCONFIG in ISPSoft, or with the relative special registers, or
you can use the COMDF instruction (API 1813) to set up the communication. Please refer to the ISPSoft manual for
setting it up in HWCONFIG. For communication register setups (SM, SR), please refer to section 6.19.3 for more
details.
6 - 6 4 0
S
3
data is written
Address into where the
data is written
Address into where the
data is written
Address into where the
data is written
S
Register where the
data written is stored
Register where the
data written is stored
Register where the
data written is stored
n
No meaning
Length of data written
Length of data written