5–28 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
S1 745 SETUP CHAPTER 5: SETPOINTS
number GEK-106636A: 745 Communications Guide.
• TRANSMISSION DELAY: Select the minimum time from when a DNP request is received
and a response issued. A value of zero causes the response to be issued as quickly as
possible.
• DATA LINK CONFIRM MODE: Select the data link confirmation mode for responses
sent by the 745. When “Sometimes” is selected, data link confirmation is only
requested when the response contains more than one frame.
• DATA LINK CONFIRM TIMEOUT: Selects a desired timeout. If no confirmation response
is received within this time, the 745 will re-send the frame if retries are still available.
• DATA LINK CONFIRM RETRIES: Select the maximum number of retries that will be
issued for a given data link frame.
• SELECT/OPERATE ARM TIMEOUT: Select the duration of the select / operate arm timer.
• WRITE TIME INTERVAL: Select the time that must elapse before the 745 will set the
‘need time’ internal indication (IIN). After the time is written by a DNP master, the IIN
will be set again after this time elapses. A value of zero disables this feature.
• COLD RESTART INHIBIT: When disabled, a cold restart request from a DNP master will
cause the 745 to be reset. Enabling this setpoint will cause the cold restart request to
initialize only the DNP sub-module.
When “Disabled” is selected, a cold restart request will cause loss of protection until
the 745 reset completes.
5.3.3.4 Network Setup
PATH: SETPOINTS S1 745 SETUP COMMUNICATIONS NETWORK SETUP
The IP addresses are used with the Modbus protocol. Enter the dedicated IP, subnet IP, and
gateway IP addresses provided by the network administrator.
To ensure optimal response from the relay, the typical connection timeout should be set as
indicated in the following table:
NETWORK SETUP [] IP ADDRESS:
0.0.0.0
Range: standard IP address format
MESSAGE
SUBNET IP MASK:
255.255.255.000
Range: standard IP address format
MESSAGE
GATEWAY IP ADDRESS:
0.0.0.0
Range: standard IP address format
TCP/IP sessions Timeout setting
up to 2 2 seconds
up to 4 3 seconds
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