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request or terminate the request with an error when the specified number
of retries has been sent.
5 ms to 65535 ms (default value = 1000 ms).
MB_DB IN Variant A reference to the instance data block used by the MB_MASTER or
MB_SLAVE instructions. After MB_SLAVE or MB_MASTER is placed in
your program, the DB identifier appears in the parameter helper drop-list
available at the MB_DB box connection.
DONE OUT Bool The DONE bit is TRUE for one scan, after the last request was completed
with no error. (Version 2.0 only) The ERROR bit is TRUE for one scan, after the last request was
terminated with an error. The error code value at the STATUS parameter
is valid only during the single scan where ERROR = TRUE.
STATUS OUT Word Execution condition code
MB_COMM_LOAD is executed to configure a port for the Modbus RTU protocol. Once a port
is configured for the Modbus RTU protocol, it can only be used by either the MB_MASTER or
MB_SLAVE instructions.
One execution of MB_COMM_LOAD must be used to configure each communication port
that is used for Modbus communication. Assign a unique MB_COMM_LOAD instance DB for
each port that you use. You can install up to three communication modules (RS232 or
RS485) and one communication board (RS485) in the CPU. Call MB_COMM_LOAD from a
startup OB and execute it one time or use the first scan system flag (Page 84) to initiate the
call to execute it one time. Only execute MB_COMM_LOAD again if communication
parameters like baud rate or parity must change.
An instance data block is assigned for MB_MASTER or MB_SLAVE when you place these
instructions in your program. This instance data block is referenced when you specify the
MB_DB parameter for the MB_COMM_LOAD instruction.
MB_COMM_LOAD data block variables
The following table shows the public static variables stored in the instance DB for the
MB_COMM_LOAD that can be used in your program.
Table 12- 65 Static variables in the instance DB
Variable Data type Description
ICHAR_GAP Word Delay for Inter-character gap between characters. This parameter is specified
in milliseconds and is used to increase the expected amount of time between
received characters. The corresponding number of bit times for this parameter
is added to the Modbus default of 35 bit times (3.5 character times).
RETRIES Word Number of retries that the master will attempt before returning the no response
error code 0x80C8.Delay for Inter-character gap between characters. This parameter is specified
in milliseconds and is used to increase the expected amount of time between
received characters. The corresponding number of bit times for this parameter
is added to the Modbus default of 35 bit times (3.5 character times).
RETRIES Word Number of retries that the master will attempt before returning the no response
error code 0x80C8.
The MB_MASTER instruction communicates as a
Modbus master using a port that was configured by
a previous execution of the MB_COMM_LOAD
instruction. An instance data block is assigned
automatically when you place the MB_MASTER
instruction in your program. This MB_MASTER
instance data block is used when you specify the
MB_DB parameter for the MB_COMM_LOAD
instruction0=No request
1= Request to transmit data to Modbus slave
MB_ADDR IN V1.0: USInt
V2.0: UInt
Modbus RTU station address:
Standard addressing range (1 to 247)
Extended addressing range (1 to 65535)
The value of 0 is reserved for broadcasting a message to all Modbus
slaves. Modbus function codes 05, 06, 15 and 16 are the only function
codes supported for broadcast.
MODE IN USInt Mode Selection: Specifies the type of request (read, write, or diagnostic).
See the Modbus functions table below for details.
DATA_ADDR IN UDInt Starting Address in the slave: Specifies the starting address of the data to
be accessed in the Modbus slave. See the Modbus functions table below
for valid addresses.
DATA_LEN IN UInt Data Length: Specifies the number of bits or words to be accessed in this
request. See the Modbus functions table below for valid lengths. Data Pointer: Points to the M or DB address (Standard DB type) for the
data being written or read.
DONE OUT Bool The DONE bit is TRUE for one scan, after the last request was completed
with no error.
BUSY OUT Bool  0 – No MB_MASTER operation in progress
 1 – MB_MASTER operation in progress
ERROR OUT Bool The ERROR bit is TRUE for one scan, after the last request was
terminated with an error. The error code value at the STATUS parameter
is valid only during the single scan where ERROR = TRUE.
STATUS OUT Word Execution condition codeMB_COMM_LOAD must be executed to configure a port before a MB_MASTER
instruction can communicate with that port.