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. HTable 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.
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