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to 49999, and 400001 to 465536 and also for word writes to Modbus addresses 40001 to
49999 and 400001 to 465536.
– Standard array of WORD, UINT, or INT data types
– Named WORD, UINT, or INT structure where each element has a unique name and
16 bit data type.
– Named complex structure where each element has a unique name and a 16 or 32 bit
data type.
● For bit reads and writes of Modbus addresses 00001 to 09999 and bit reads of 10001 to
19999.
– Standard array of Boolean data types.
– Named Boolean structure of uniquely named Boolean variables..
● Although not required, it is recommended that each MB_MASTER instruction have its
own separate memory area. The reason for this recommendation is that there is a greater
possibility of data corruption if multiple MB_MASTER instructions are reading and writing
to the same memory area.
● There is no requirement that the DATA_PTR data areas be in the same global data block.
You can create one data block with multiple areas for Modbus reads, one data block for
Modbus writes, or one data block for each slave station.he following table shows the public static variables stored in the instance DB for
MB_MASTER that can be used in your program.
Table 12- 70 Static variables in the instance DB
Variable Data type Initial value Description
Blocked_Proc_T
imeout
Real 3.0 Amount of time (in seconds) to wait for a blocked Modbus Master instance
before removing this instance as being ACTIVE. This can occur, for example,
when a Master request has been issued and then the program stops calling
the Master function before it has completely finished the request. The time
value must be greater than 0 and less than 55 seconds, or an error occurs.
The default value is .5 seconds.
Extended_Addr
essing
Bool False Configures single or double-byte slave addressing. The default value = 0.
(0=single byte address, 1=double-byte address)
Your program can write values to the Blocked_Proc_Timeout and Extended_Addressing
variables to control Modbus master operations. See the MB_SLAVE topic description of
HR_Start_Offset and Extended_Addressing for an example of how to use these variables in
the program editor and details about Modbus extended addressingNo error
80C8 Slave timeout. Check baud rate, parity, and wiring of slave.
80D1 The receiver issued a flow control request to suspend an active transmission and never reenabled
the transmission during the specified wait time.
This error is also generated during hardware flow control when the receiver does not assert
CTS within the specified wait time.
80D2 The transmit request was aborted because no DSR signal is received from the DCE.
80E0 The message was terminated because the receive buffer is full.
80E1 The message was terminated as a result of a parity error.
80E2 The message was terminated as a result of a framing error.
80E3 The message was terminated as a result of an overrun error.
80E4 The message was terminated as a result of the specified length exceeding the total buffer size.
8180 Invalid port ID value or error with MB_COMM_LOAD instruction