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Function Blocks
MBS Modbus Slave Function Block
198
HC900 Hybrid Control Designer Function Block Reference Guide
Revision 11
2/07
Outputs
RD1 through RD4
= Last read value from the selected address
NO_SCAN
= Scan Indication
ON = Device is “Out of Scan”
OFF = Device is “In Scan”.
BAD_COM
= Communications Indication
ON = Bad quality or device not defined
OFF
=
Good
Communications
ADDR
= Slave Address for use with MBR and MBW function blocks
ATTENTION
•
Integer values are converted to floating point values prior to output.
•
If a Modbus slave device does not respond to a request, the last output value will be
maintained.
Block properties
Double click on the function block to access the function block properties dialog box.
Configuration parameters
The ON/OFF properties dialog box is divided into Three tab cards:
GENERAL
READ
WRITE
Click on the tab to access the properties for that tab.
GENERAL tab
It looks like this graphically.
H
Table 60 describes the parameters and the value or selection.
Table 60 MBS Block General tab configuration parameters
Properties Function
Parameter
Index #
Parameter Description
Value or Selection
Configure Modbus
Slave
Slave Tag
Name
1 Description
of
Slave
Device
16-character tag name
Slave address and Tag Name
must be unique within a control
file.
Содержание HC900
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