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Note
When the register mode is set to SIM_2251, the data type is set automatically by the Modbus
program, based on the specified data address.
4. In the Quantity field, type the number of registers to be retrieved.
The Modbus test program will accept a quantity value of 1 to 2016. The requested
number of registers cannot exceed the amount contained by the selected message
block but you can retrieve a partial block. You cannot cross a message block
boundary.
Also, in Standard Modbus mode each register is 16 bits. Therefore, integers (SHORT)
consist of 1 register while floats (FLOAT) and long integers (LONG) consist of 2
registers.
Note
Boolean registers are not user-defined (for either SIM_2251 or User_Modbus) and primarily
contain alarm flags useful for debugging. To view the contents of Boolean registers, select the
1 (Read Coil) function code.
Numeric registers for User_Modbus can be user-defined. To view the contents of Numeric
registers, select the 3 (Read Regs) function code.
5. Type the desired repeat count, which is the number of times the Modbus program
should read or set the specified registers before ceasing transmission, in the Repeat
field.
The Modbus program will accept a repeat value of 1 to 9999. A value of –1 produces
an infinite polling loop that can be terminated by clicking Stop.
7.1.4 Transmit a single data type
To assign a data type to a group of registers you will read or edit, do the following:
Note
To learn the variable names that are assigned to the Modbus registers before retrieving the data,
generate a GC Config Report and review the Communication section.
1. In the Slave Addr field, type the COM ID of the GC.
The Modbus test program will accept a slave address value of 1 to 247.
To use Broadcast Mode, which directs the Modbus test program to poll all known
devices, enter 0 in the Slave Addr field. Each device interprets this poll attempt as an
instruction to read and take action; however, a response message may not be
received by the Modbus test program.
Note
Changes are applied to the corresponding register value at each device.
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