Honeywell HC900 Reference Manual page 209

Sequence Parameter
Number Field
4
5
6
You must press [APPLY] to accept the register changes.
7
Revision 11
2/07
Action
From the drop down
menu, select the
Register Data Type
Select a function code
for "Float, Unsigned,
Signed, or Bit Packed"
register data type
Select a function code
for "Single Bit"
Register data type.
Select which bit (0-15)
to read when Register
Data Type = Bit Packed
HC900 Hybrid Control Designer Function Block Reference Guide
MBR Modbus Read Function Block
Selections
Float
•
If read as an integer,
the output is converted
• Unsigned 32
to a floating point.
• Signed 32
• Unsigned 16
• Signed 16
• Bit Packed
• Single Bit
Read Holding Function code 03 or
•
Reg – Function Function code 04 is
Code 03 used to read the
contents of input
• Read Input
registers in the slave.
Registers –
Function Code
04
• Read Coil Function code 01 is
Status – used to read a slave's
Function Code coil's (discrete output's)
01 ON/OFF status of the
slave device in a binary
• Read Input
data format.
Status –
Function Code Function code 02 is
02 used to read a slave's
input's (discrete
input's) ON/OFF status
of the slave device in a
binary data format.
Output is floating point
equivalent (0.0 or 1.0).
NOTE: Refer to the
Communications
manual for the function
codes supported by the
specific device.
0 to 15 If read as a bit packed
number, you must
select which bit to
mask (0-15).
The output will be the
floating-point
equivalent (0.0 or 1.0)
of the masked bit.
Function Blocks
Comments
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