Table of Contents
Advertisement
the documentation supplied with the slave device. For convenience, this example uses a FEC920 as the slave;
the table in Section 7.3 of this document providing the required data.
Select configuration menu
Programmer
Modbus Master
EtherNet/IP
Digital I/O
User Lin
Custom Message
Zirconia
DATA PARAMETERS
This lists all possible configuration fields that might appear, not just those shown in the examples above.
Descriptor
PV
Sys Alm status
Chan. Alm Status
Set
Mode
Value
Fall Back Value
Send
Status
Page 94
FEC920: USER GUIDE
Data
Figure 84 User defined parameters
Up to 20 characters used to describe the current data item (used in the Modbus Master
user page (Section 5.4.7)).
The process value currently being read from the selected slave. Visible only if data item
is not an alarm type. The value must be wired to a virtual channel with 'Operation' = 'Copy'
if it is to be trended and/or recorded.
The status (e.g. None, Active) of the data item. Visible only for specific read profiles. The
value must be wired to a virtual channel with 'Operation' = 'Copy' if it is to be trended and/
or recorded.
The status of the data item. Visible only for specific read profiles. The value must be wired
to a virtual channel with 'Operation' = 'Copy' if it is to be trended and/or recorded.
Allows the user to set an on/off value. Visible only for specific write profiles.
Allows the user to set an auto/manual value. Visible only for specific write profiles.
Configured or wired value to be sent to the selected slave. This parameter is available only
with function codes 6 & 16.
The value to be sent to the selected slave if the 'Value' parameter is wired and has a status
other than GOOD_PV. This parameter is available only with function codes 6 & 16 It is not
possible to wire Fall Back Value from another parameter and it can be configured only
manually.
A one shot action that sends the data in the 'Value' parameter or the 'Fall Back Value'
parameter (depending upon the status of 'Value') to the selected slave. This is classed as
an acyclic write and so is available only for function codes 6 & 16. The 'Priority' parameter
must be set to 'Acyclic'.
The status of the last transaction sent to the selected slave.
Success: The transaction was successfully actioned by the slave device.
Timeout: There was no response from the slave device to a given request within the
configured time.
Illegal Address: The request to the slave device contained an invalid Modbus address.
The address may be for a read only parameter.
Illegal Value: The request to the slave device contained invalid data for the specified
parameter.
Bad Sub: The sub function code in the request was invalid.
Idle: This data item is currently idle and not communicating with the slave device
Illegal Code: The slave does not support the function code transmitted by the master.
A5E45696052A Rev-AA
Modbus Master.1.Data
Descriptor
Ch1 PV
PV
23.6
Status
Success
Slave Device
Slave 2
Parameter List
User Defined
Modbus Address
256
Function Code
Read Input (4)
Data Type
REAL
Priority
Medium
September 18
Advertisement
Table of Contents
