Honeywell HC900 - Page 406

Function Blocks
TCPS Function Block
392 HC900 Hybrid Control Designer Function Block Reference Guide Revision 11
2/07
Properties Function Parameter Index # Parameter Description Value or Selection
Function
Code
N/A
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
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.
Select Bit
23-26
Bit to read when Read
register’s data type = Bit
Packed
You must then select
which bit to mask (0-15).
The output will be the
floating-point equivalent
(0.0 or 1.0) of the masked
bit.
0-15