FEC920: USER GUIDE
Page 67
September 18
6.2.4 Modbus TCP
This allows the user to configure the instrument so as to allow it to communicate using Modbus Transmission
Control Protocol.
Figure 62 Modbus TCP configuration menu
PrefMaster IP
The IP address of the relevant Modbus master. The Preferred master is guaranteed to be
able to connect, even if all slave connections (max. = 4 for TCP) are in use.
Address
The Modbus address for this slave. This address must be unique for the network to which
it is attached. The instrument will respond to this address and to Address 255.
Input Timeout
Allows a value of between 0 and 3600 seconds to be entered to set the timeout period for
modbus input channels. If a Modbus input is not written to within this period the value of
the channel is set to -9999.0 with a 'No Data' status. A value of 0 disables the comms
inactivity timeout feature.
Unit ID Enable
Enables/Disables the checking of the Modbus TCP unit identity field.
Strict
The Modbus TCP Unit Identity Field (UIF) does not have to match the
instrument address. The instrument responds only to Hex value FF in the
UIF. iTools finds this instrument only at location 255, and then stops
scanning.
Loose
The Modbus TCP Unit Identity Field (UIF) does not have to match the
instrument address. The instrument responds to any value in the UIF.
Instrument The Modbus TCP Unit Identity Field (UIF) must match the instrument address
or no response will be made to messages.
Serial Mode
Slave communications via the side mounted configuration port interface (CPI) clip (for
iTools use.) Parameters: Baud rate = 19,200; Parity = none; Number of data bits = 8;
Number of stop bits = 1; no flow control. Can be set to ‘Modbus Slave’ or ‘Off’. The unit
must be restarted before any change takes effect.
Time Format
Allows the user to choose milliseconds, seconds, minutes or hours as the time format.
Sets the resolution for the reading and writing of time format parameters.
PrefMaster Conn
Read only. Shows the IP address of the preferred master, when connected.
Response Time
Read only. Shows the response time for a single communications request to the relevant
master.
123.123.123.123
1
0 sec
Instrument
Modbus Slave
Seconds
123.123.123.123
PrefMaster IP
Address
Input Timeout
Unit ID Enable
Serial Mode
Time Format
PrefMaster Conn
Network.Modbus
0
0.0.0.0
0
0.0.0.0
0
0.0.0.0
0
0.0.0.0
0
Response Time
Master Conn 1
Response Time
Master Conn 2
Response Time
Master Conn 3
Response Time
Master Conn 4
Response Time
A5E45696052A Rev-AA
