Honeywell HC900 Reference Manual page 214

Function Blocks
MBS Modbus Slave Function Block
Properties Function
200
Parameter Index #
N/A
Register
Data Type
N/A
Function
Code
23-26
Select Bit
HC900 Hybrid Control Designer Function Block Reference Guide
Parameter Description
Register data type
Several standard Modbus
RTU function codes are
supported. These
standard function codes
provide basic support for
IEEE 32-bit floating point
numbers and 16-bit
integer register
representation of
instrument's process data
Bit to read when Read
register's data type = Bit
Packed
Value or Selection
From the drop down menu,
select the Register Data Type
• Float
• Unsigned 32
• Signed 32
• Unsigned 16
Signed 16
•
• Bit Packed
• Single Bit
If read as an integer, output is
converted to floating point
equivalent.
Function code 03 – Read
Holding Registers or
Function code 04 – Read Input
Registers is used to read the
contents of input registers in the
slave.
Supported Data Types for
Function Codes 03 and 04.
From the drop down menu,
select a function code for
"Float, Unsigned, Signed, or
Bit Packed" register data type
Function code 01 – Read Coil
Status is used to read the coil's
(discrete output's) ON/OFF
status of the slave device in a
binary data format.
Function code 02 – Read Input
Status is used to read the
input's (discrete input's)
ON/OFF status of the slave
device in a binary data format.
Supported Data Types for
Function Codes 01 and 02.
Select a function code for
"Single Bit" Register data
type.
NOTE: Refer to the
Communications manual for the
function codes supported by the
specific device.
0-15
Revision 11
2/07