FEC920: USER GUIDE
Page 94
September 18
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.
Figure 84 User defined parameters
DATA PARAMETERS
This lists all possible configuration fields that might appear, not just those shown in the examples above.
Descriptor
Up to 20 characters used to describe the current data item (used in the Modbus Master
user page (Section 5.4.7)).
PV
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.
Sys Alm status
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.
Chan. Alm Status
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.
Set
Allows the user to set an on/off value. Visible only for specific write profiles.
Mode
Allows the user to set an auto/manual value. Visible only for specific write profiles.
Value
Configured or wired value to be sent to the selected slave. This parameter is available only
with function codes 6 & 16.
Fall Back Value
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.
Send
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'.
Status
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.
Data
Programmer
Modbus Master
EtherNet/IP
Digital I/O
User Lin
Custom Message
Zirconia
Select configuration menu
Ch1 PV
23.6
Success
Slave 2
User Defined
256
Read Input (4)
Descriptor
PV
Status
Slave Device
Parameter List
Modbus Address
Function Code
Modbus Master.1.Data
REAL
Medium
Data Type
Priority
A5E45696052A Rev-AA