DNP3 Slave/Server RTU Protocol Parameters

Introduction

Select DNP3 as Protocol, an Ethernet network as Network Type and Slave (server) as Mode.

Channel Parameters

Click Setup → Channel → DNP3 NET Server → Parameters:

NOTE: There is no basic channel parameter to configure in the DNP3 slave/server case.

Parameter	Value scope	Default value	Description
Event Backup Enable	check box	unchecked	Refer to the DNP3 Event Queue Setting topic to specify which events to configure as backup or turned off when a power loss occurs.
Event Restore Mode	Main Channel/All Channels	Main Channel	indicates which channel the events restore

Configure the module advanced parameters:

Parameter	Value scope	Default value	Description
Rx Frame Size	0...292	292	indicates the maximum received message frame size in the data link layer (bytes)
Tx Frame Size	0...292	292	indicates the maximum Transmit message frame size in the data link layer (bytes)
Rx Frame Timeout (ms)	0...4294967295	15000	indicates the time-out while waiting for a complete frame after receiving frame synchronization
Confirm Mode	NEVER SOMETIMES ALWAYS	NEVER	specifies when a link layer confirmation can be requested
Confirm Timeout (ms)	0...4294967295	2000	indicates the maximum time to wait for link level confirmation if requested
Max Retries	0...255	3	indicates the retry count of link layer confirmation time-outs
Offline Poll Period (ms)	0...4294967295	10000	specifies the duration to re-establish communication for an offline session
First Char Wait (ms)	0...65535	0	indicates the minimum time between reception and transmission
Rx Buffer Size	0...256	256	indicates the received buffer size of serial port (bytes)
Rx Fragment Size	0...2048	2048	indicates the maximum message frame length in the data link layer (bytes)
Tx Fragment Size	0...2048	2048	indicates the maximum message frame length in the data link layer (bytes)
Analog Mode (1)	All 32-bits Mixed Mode	All 32-bits	specifies dynamic memory allocation for analog points. Behavior: All 32-bits: 32 bits are always allocated, no matter if it is for 16 bits or 32 bits analog input/output. Mixed Mode: Memory allocation depends on the analog input/output size.
1: This feature is available with firmware V1.7 or later.

Session Parameters

Click Setup → Channel → DNP3 NET Server → Session → Parameters:

Parameter	Value scope	Default value	Description
Local Address	1...65520	4	indicates the source address for this session
Master Address	1...65520	3	indicates the destination address for this session

Configure the module with advanced parameters:

Parameter	Value scope	Default value	Description
Link Status Period (ms)	0...4294967295	2500	indicates the period to send link status requests if no DNP3 frames are received on this session
Validate Source Address	check box	unchecked	specifies if the source address is validated in received frames
Enable Self Address	check box	unchecked	responds with its own address so that the master can automatically discover the slave address
Multi Frag Resp Allowed	check box	checked	specifies if the application is allowed to send multi-fragment responses
Multi Frag Confirm	check box	checked	specifies if the application layer confirmations are requested for no final fragments of a multi-fragment response
Respond Need Time	check box	unchecked	specifies if this device sets the need time IIN bit in response to this session at startup and after the clock valid period has elapsed
Clock Valid Period (ms)	0...4294967295	1800000	specifies the period for which the clock remains valid after receiving time synchronization
Application Confirm Timeout (ms)	0...4294967295	10000	specifies the period for which the slave DNP3 device waits for the application layer confirmation from the master
Select Timeout (ms)	0...4294967295	5000	specifies the maximum amount of time that a selection remains valid before the corresponding operation is received
Warm Restart Delay (ms)	0...65535	2000	indicates that the master should wait after receiving a response to a warm restart request
Cold Restart Delay (ms)	0...65535	5000	indicates that the master should wait after receiving a response to a cold restart request
Allow Multi CROB Requests	check box	checked	determines if the objects of the Multiple Control Relay Output block are allowed in a single request
Max Control Requests	0...10	10	determines if the maximum number of controls are allowed in a single request
Unsol Allowed	check box	checked	determines if the unsolicited responses are allowed
Send Unsol When Online	check box	unchecked	determines if the unsolicited null responses are transmitted when the session comes online
Unsol Class 1	check box	unchecked	specifies the initial/new state of the unsolicited event mask (only RTU V1.0)
Unsol Class 2	check box	unchecked	specifies the initial/new state of the unsolicited event mask (only RTU V1.0)
Unsol Class 3	check box	unchecked	specifies the initial/new state of the unsolicited event mask (only RTU V1.0)
Unsol Class 1 Max Events	0...255	5	If unsolicited responses are enabled, UnsolClassXMaxEvents specifies the maximum number of events in the corresponding class to be allowed before an unsolicited response is generated.
Unsol Class 2 Max Events	0...255	5	If unsolicited responses are enabled, UnsolClassXMaxEvents specifies the maximum number of events in the corresponding class to be allowed before an unsolicited response is generated.
Unsol Class 3 Max Events	0...255	5	If unsolicited responses are enabled, UnsolClassXMaxEvents specifies the maximum number of events in the corresponding class to be allowed before an unsolicited response is generated.
Unsol Class 1 Max Delay (ms)	0...4294967295	5000	specifies the maximum amount of time after an event in the corresponding class is received before an unsolicited response is generated
Unsol Class 2 Max Delay (ms)	0...4294967295	5000	specifies the maximum amount of time after an event in the corresponding class is received before an unsolicited response is generated
Unsol Class 3 Max Delay (ms)	0...4294967295	5000	specifies the maximum amount of time after an event in the corresponding class is received before an unsolicited response is generated
Unsol Max Retries	0...65535	3	specifies the maximum number of unsolicited retries before changing to the offline retry period
Unsol Retry Delay	0...4294967295	5000	specifies the time to delay after an unsolicited confirmation time-out before retrying the unsolicited response
Unsol Offline Retry Delay (ms)	0...4294967295	30000	specifies the time to delay after an unsolicited time-out before retrying the unsolicited response after UnsolMaxRetries are attempted
Delete Oldest Event	check box	unchecked	specifies if the oldest event is removed from the event queue when buffer is full and a new event comes. Checked: Remove the oldest event. Unchecked: Ignore the new event.
Pulse Duration	0...4294967295	1000	indicates the width of the pulse in milliseconds
Counts to Class0Poll	Count Value Frozen Value	Count Value	specifies whether static counter data (Count Value) or static counter frozen data (Frozen Value) is returned in polls of class0 data
Routing Offline (1)	Valid Quality Invalid Quality	Valid Quality	specifies if routing point quality depends on connection state with subslave or subserver. Behavior: Valid Quality: Routing points quality does not change when connection is lost. Invalid Quality: Routing points quality is marked as invalid when connection is lost.
Data Synch Mode	Cyclic Synch Synch On Demand	Cyclic Synch	specifies how the data are synchronized: either cyclically or when the slave station receives a request from the master (see Note). It is used only by analog outputs.
SBO Mode (1)	Interference Mode Noninterference Mode	Interference Mode	specifies the commands allowed to cancel a Select command in a sequence Behavior: Interference Mode: Select can be canceled by any command except Operate command. Noninterference Mode: Select can be canceled by any command.
Trip-Close Mode (1)	Even Mode Consecutive Mode	Even Mode	specifies if trip_close DNP3 points are consecutive or not
PLC State (1)	No Impact Quality Impact Quality	No Impact Quality	for non-routing points, specifies if the PLC state modifies or not the quality bit when quality is required by the master. Behavior: No Impact Quality: PLC state has no effect on the quality bit. Impact Quality: PLC state has an effect on the quality bit. A PLC in STOP state or a PLC missing generates an invalid quality bit. A PLC in RUN state generates a valid quality bit.
1: This feature is available with firmware V1.7 or later. NOTE: Only %MW and %M output points are supported in the Synch On Demand mode. To make local change operational by CPU application on digital or analog output, select Synch On Demand mode.

Unsolicited Response Parameters

Unsol Class x Max Events and Unsol Class x Max Delay parameters are used as triggers to initiate unsolicited messages.

Each event class (1...3) has its own parameters. Once the trigger conditions match for at least one event class, all event classes enabled to initiate unsolicited messages send the messages (whether they met the trigger conditions or not).

Example:

Settings:
- Unsolicited responses allowed for Class 1 + Class 2
- Unsolicited responses not allowed for Class 3
Trigger condition (max events or max delay reached):
- Class 1 does not meet trigger condition.
- Class 2 meets trigger condition.
- Class 3 is not evaluated (unsolicited response not allowed).
Result:
- Class 1 + Class 2 send the events stored.
- Class 3 does not send events.