IEC 60870-5-101 Slave RTU Protocol Parameters
Original instructions
About us
Introduction
Select IEC101-104 as Protocol, Slave as Mode, and Raw Serial as Network Type.
Channel Parameters
Click Setup → Channel → IEC-101 Slave → Parameters:
Parameter
Value scope
Default value
Description
DL Address Length
1...2
1
indicates the bytes used for data link address
Use Balanced Mode
check box
unchecked
indicates the usage of balanced or unbalanced mode
Event Backup Enable
check box
unchecked
indicates whether to backup event on loss of power
Event Time Quality
Invalid, Original Quality
Original Quality
When restoring backup events after power restoration, the time quality is forced to
  • invalid with Forcing Invalid
  • the original quality with Original Quality
NOTE: The box Event Backup Enable must be checked beforehand
Session Count
1...32
1
indicates the maximum number of sessions on the channel
Configure the module’s advanced parameters:
Parameter
Value scope
Default value
Description
First Char Wait (ms)
0...65535
0
indicates the minimum time between reception and transmission
Rx Buffer Size
0...256
256
indicates the receive buffer size of serial port (bytes)
One Char Ack Allowed
check box
unchecked
allows transmission of one-character E5 instead of the fixed-length ACK message
One Char Nack Allowed
check box
unchecked
allows transmission of one-character response instead of the fixed-length NACK message, when no response data is available
Rx Frame Timeout (ms)
0...4294967295
15000
indicates the timeout of waiting for a complete frame after the receiving frame synchronization
Confirm Mode
NEVER/SOMETIMES/ALWAYS
ALWAYS
specifies when to request the link layer confirmation for variable sized frames that contain user data, which is not transmitted to the broadcast address
Confirm Timeout (ms)
0...4294967295
2000
indicates the maximum waiting time for link level confirmation, if requested
Max Retries
0...255
2
indicates the retry count of the link layer confirmation timeouts
Test Frame Period (ms)
0...4294967295
0
specifies the period for transmitting the verification message, to prove that the remote device is still online in the balance mode
Offline Poll Period (ms)
0...4294967295
10000
specifies the period to re-establish transfer of an offline session
Incremental Timeout (ms)
0...4294967295
30000
indicates the incremental application layer timeout
Session Parameters
Click Setup → Channel → IEC-101 Slave → Session → Parameters:
Parameter
Value scope
Default value
Description
Data Link Address
0...65535
3
indicates bytes for the data link address
CAA Size
1...2
2
specifies bytes for common address of Application Specific Data Unit
IOA Size
1...3
2
specifies bytes of IOA
COT Size
1...2
1
specifies bytes of COT
Sector Count
1...5
1
indicates sectors for this session
Configure the module’s advanced parameters:
Parameter
Value scope
Default value
Description
Max ASDU Size
0...252
252
indicates the maximum size of an Application Specific Data Unit
Max Poll Delay (ms)
0...4294967295
20000
indicates the maximum time between link polls before the unbalanced slave is declared offline
Sector Parameters
Click Setup → Channel → IEC-101 Slave → Session → Sector → Parameters:
Parameter
Value scope
Default value
Description
Common ASDU Address
1...65535
3
indicates the common address of ASDU, 65535 is broadcast address
Cyclic Message Interval (ms)
0...4294967295
10000
specifies the number of milliseconds between cyclic updates
Background Period (ms)
0...4294967295
20000
specifies the period to generate background scan data on this sector
Default Response Timeout (ms)
0...4294967295
60000
indicates the default timeout for the confirmation of request
Send Clock Sync Events
check box
unchecked
controls if spontaneous clock synchronization events are transmitted to the master. The time format is CP24
Read Time Format
None/ CP24/ CP56
None
specifies the completeness time format for respond to C_RD_NA
C_RD_NA Measurands Time Format
None/ CP24/ CP56
None
specifies the time format for respond to C_RD_NA
C_IC_NA Time Format
None/ CP24/ CP56
None
specifies the time stamp format in response of C_IC_NA
Configure the module with advanced parameters:
Parameter
Value scope
Default value
Description
Select Timeout (ms)
0...4294967295
5000
specifies the period after which a previously received selection is timed-out. An execute command must be received before the timeout in order to be valid.
ACTTERM with CSE Setpoint
check box
checked
specifies if ACT TERM is transmitted upon completion of the set point commands: C_SE_NA, C_SE_NB, C_SE_NC, C_SE_TA, C_SE_TB, C_SE_TC
ACTTERM with Command
check box
checked
specifies if ACT TERM is transmitted upon completion of commands, other than the set point commands.
Clock Valid Period (ms)
0...4294967295
86400000
specifies the period for which the system clock remains valid after a clock synchronization. If this period expires without a clock synchronization, all times are reported invalid.
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.
Short Pulse Duration
0...4294967295
100
specifies the width of the pulse in milliseconds
Long Pulse Duration
0...4294967295
1000
specifies the width of the pulse in milliseconds
Counter Mode
Freeze On Demand
Local Freeze Only
Local Freeze and Reset
Freeze On Demand
specifies the mode of freezing counter
To support Mode A or Mode B, select either Local Freeze Only or Local Freeze and Reset.
To support Mode C or Mode D, select Freeze On Demand.
Auto Local Freeze (1)
Auto Enabled
Control by App
Auto Enabled
specifies the local freeze start and stop conditions
Behavior: Auto Enabled: Local freeze starts automatically after the module’s startup or restart. Control by App: Local freeze is configured by CPU application. Use CUSTOM_CMD data structure.
Freeze Period(Grp-G) (1)
0...4294967295
2000
specifies the period (in milliseconds) at which to freeze the counter automatically on all the groups. It only takes effect on local freeze.
Value 0 disables freezing.
Freeze Period(Grp-1) (1)
0...4294967295
2000
specifies the period (in milliseconds) at which to freeze the counter automatically on group 1. It only takes effect on local freeze.
Value 0 disables freezing.
Freeze Period(Grp-2) (1)
0...4294967295
2000
specifies the period (in milliseconds) at which to freeze the counter automatically on group 2. It only takes effect on local freeze.
Value 0 disables freezing.
Freeze Period(Grp-3) (1)
0...4294967295
2000
specifies the period (in milliseconds) at which to freeze the counter automatically on group 3. It only takes effect on local freeze.
Value 0 disables freezing.
Freeze Period(Grp-4) (1)
0...4294967295
2000
specifies the period (in milliseconds) at which to freeze the counter automatically on group 4. It only takes effect on local freeze.
Value 0 disables freezing.
Summer Bit
check box
unchecked
specifies whether to manage the summer bit of time stamp which comes from an external device or CPU. Effective only when Daylight Saving Time is enabled
CMD Queue Size
1...128
1
specifies the size of the command queue to process in parallel for each point type
C_DC Impulse
Indeterminate State
Determinate State
Determinate State
specifies whether the final state is in valid state or Indeterminate state.
Behavior: Determinate State: only ON and OFF are valid states, the final state is ON or OFF after impulse. Indeterminate State: the final state is 0 after executing any impulse.
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 data of type C_SE_NA, C_SE_NB, C_SE_NC and C_BO_NA
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 control points are supported in the Synch On Demand mode.
Counter Mode for Local Freeze and Freeze On Demand
Configuration for Counter Mode:
Counter Mode
M_IT Events Configured
M_IT Events Not Configured
Local Freeze
Mode A
Mode B
Freeze On Demand
Mode D
Mode C
NOTE: In mode Local Freeze and Reset, the counter is automatically frozen at the value 0.
NOTE: If counter events buffer is configured, Mode A is set by default. A mixed counter event mode is not supported. Only one counter event mode is supported at a time.
The Freeze Period(Grp-x) parameter can be configured in milliseconds to freeze automatically for Mode A or Mode B. The frozen counter is reported spontaneously with valid events.
NOTE: The Counter event buffer must be configured for Mode A in case of an event loss. You can enable to delete oldest events in order to prevent new events from being lost.
CUSTOM_CMD Data Structure
CUSTOM_CMD (DWORD):
Name
Type
Word
Description
Command
WORD
0
Start or stop local freezing.
Status
WORD
1
Provides the freezing command status for each group.
Command (WORD):
Name
Type
Bit
Description
Command
BOOL
0
Global group control.
Bit value: 0: Stop freezing. 1: Start freezing.
BOOL
1
Group 1 control.
Bit value: 0: Stop freezing. 1: Start freezing.
BOOL
2
Group 2 control.
Bit value: 0: Stop freezing. 1: Start freezing.
BOOL
3
Group 3 control.
Bit value: 0: Stop freezing. 1: Start freezing.
BOOL
4
Group 4 control.
Bit value: 0: Stop freezing. 1: Start freezing.
–
5...15
Any value change triggers the command (start or stop freezing)
Status (WORD):
Name
Type
Bit
Description
Status
BOOL
0
Global group status.
Bit value: 0: Freezing is disabled. 1: Freezing is enabled.
BOOL
1
Group 1 status.
Bit value: 0: Freezing is disabled. 1: Freezing is enabled.
BOOL
2
Group 2 status.
Bit value: 0: Freezing is disabled. 1: Freezing is enabled.
BOOL
3
Group 3 status.
Bit value: 0: Freezing is disabled. 1: Freezing is enabled.
BOOL
4
Group 4 status.
Bit value: 0: Freezing is disabled. 1: Freezing is enabled.
–
5...15
Freezing execution status.
Group of bits value: 0: Freezing command executed. 1: Freezing command not executed.
Daylight Saving Time and Summer Standard Time
The Daylight Saving Time (DST) is an optional feature which can be configured in the time zone web page (disabled by default):
NOTE: The Summer Bit is not supported in CP24Time2a.