Veichi 300 Series User manual

1
Operation Manual of PROFINET 300 Series
Expansion Card
1 Product Overview
Thank you for using VEICHI AC300 series frequency inverter (AC300 and AC310 frequency
inverter) and choosing AC300 PROFINET expansion card AC300PN1. The AC300PN1card is
composed of two boards, AC300PN_CJ、AC300PN_CN, which are connected by communication
line. The physical diagram of the two boards is shown in Figure 1.1
Figure 1.1 Hardware object diagram
2 Hardware layout and RJ45 interface
2.1 Hardware Layout
The hardware layout of AC300PN1 card is shown in Figure 2.1
Figure 2.1 Hardware layout
The communication status of AC300PN1 card can be displayed by indicator light. The meaning of
different status of each indicator is shown in Table 2.1
Table 2.1 description of indicator light
Indicator
light
Indicator
status State description Processing method
Power
Light on The power supply is normal Nothing
Light off Abnormal power supply Power on or replace the expansion card
Led1 Light on RJ45 port is not started, and
the power system is faulty
Check whether the network cable is connected
correctly, and check whether the GSD version

2
or configuration is wrong
Light off RJ45 port is started, and the
power system is normal Nothing
Led2
Flashing Inverter fault Check the frequency inverter fault type, and
then do further processing
Light off The frequency inverter is
normal Nothing
Led3
Flashing
Abnormal communication
check between expansion card
and frequency inverter
Check the version of frequency inverter PN
card and software;
Observe whether the card is inserted into the
frequency inverter; replace the expansion card
Light off Normal Nothing
Led4
Flashing
The function of the expansion
card to read and write the
inverter is abnormal
Confirm whether the GSD file is correct;
Check whether the selected address of PZD is
correct
Light off Normal Nothing
Led5
Flashing
(0.25s)
Abnormal connection of
master station Check the wiring of the master station
Flashing
(0.5s)
Abnormal connection of
master station
The master station is connected to the slave
station or is downloading PLC program
Light off Master slave communication
is normal Nothing
Link0/1
The green
light is on
The power supply of network
cable is normal Nothing
The green
light is off
The power supply of network
cable is abnormal
Check whether the communication line is
plugged in properly
The yellow
light is on Communication is normal Nothing
The yellow
light is
flashing
Establishing communication Nothing
2.2 PROFINET RJ45 interface description
AC300PN1 is connected with PROFINET master station by standard Ethernet RJ45 socket. Its pin
definition is consistent with that of standard Ethernet pin, both cross line and direct connection are
available
Table 2.2 PROFINET communication terminal description
Terminal name Explain
Network port CN1 The terminal has no direction and can be connected to the terminal near PLC. Facing
RJ45, the right side is network port 1, and the left side is network port 2.
CN2 port network

3
3 Communication Configuration Description
AC300PN1 card supports AC300 series frequency inverters (AC300 and AC310 frequency
inverters). The relevant function codes should be set for the AC 300PN1 card to communicate with
the frequency inverter normally
3.1 AC300 Communication Configuration
3.1.1 Description ofAC300 Inverter Communication Configuration
Table 3.1.1 AC300 function code setting
Function
code Name Setting range Setting value Meaning
F00.02 Run command
selection
0: Keyboard given
1: Terminal setting
2: RS485
3: Purchase card
2 The command is given by RS485
F00.03 Frequency given
source channel
0: keyboard number given
1: Keyboard analog
potentiometer setting
…
10: Purchase card
6 The frequency is given by RS485
F00.10
Upper limit
frequency source
selection
Select the given source of
frequency inverter upper
limit
0: Upper limit frequency
given
1: Reserved
2: Current and voltage
analog AI1 given
3: Current and voltage
analog AI2 given
4: Reserved
5: Terminal pulse PUL
setting
6: RS485 communication
given
7: Purchase card
-
If you use AC300PN1 card to limit
the upper limit frequency, you
need to set this to 6
F07.01 Torque command
setting
0: Keyboard number
1: Keyboard
potentiometer setting
…
6: RS485 communication
setting
7: Purchase card
- If the torque command is given by
AC300PN1 card, it is set to 6
F07.10 Speed limit 0: Set by function code - If restricted by AC300PN1 card, it

4
selection of forward
rotation in torque
control
F07.12
1: Reservation
…
6: RS485 given * F07.12
7: Purchase card * F12.07
is set to 6
F07.11
Torque control
reverse speed limit
selection
0: Set by function code
F07.13
1: Reservation
…
6: RS485 given * F07.13
7: Purchase card * F07.13
- If restricted by AC300PN1 card, it
is set to 6
F07.12
Maximum forward
speed when
controlled by torque
0.0%～100.0% - Default 100.0%, relative
maximum frequency (F00.09)
F07.13
Maximum reverse
speed when
controlled by torque
0.0%～100.0% - Default 100.0%, relative
maximum frequency (F00.09)
3.1.2Address Description ofAC300 Communication Control Group
Table 3.1.2 Address description of AC300 communication control group
Address
definition Function description Explanation of data significance R/W characteristic
0x3000 Communication given frequency 0.01 Hz, e.g.: 5000 corresponds to
50Hz R/W
0x3001 Communication command setting
0: No command
1: Forward running
2: Reverse running
3: Forward jog
4: Reverse jog
5: Slow down and stop
6: Freely stop
7: Fault reset
8: Run forbidden command
9: Run allow command
R/W
0x3004 Communication given upper limit
frequency Unit: 0.01Hz R/W
0x3005 Communication torque setting Unit 0.1% R/W
0x3006 Maximum forward frequency limit of
torque control Unit 0.1% R/W
0x3007 Maximum reverse frequency limit of
torque control Unit 0.1% R/W
0x3008 Communication given PID setting
value Unit 0.1% R/W

5
0x3009 Communication given PID feedback
value Unit 0.1% R/W
0x300A Voltage setting of voltage frequency
separation Unit 0.1% R/W
0x300B Tension setting 0 ~ maximum tension R/W
0x300C Coil diameter setting 0 ~ maximum coil diameter R/W
0x300D Linear speed setting 0 ~ maximum linear speed R/W
0x300E retain - R/W
0x300F retain - R/W
0x3011 retain - R/W
0x3012 retain - R/W
0x3013 Tension PID feedback (PROFINET
write data invalid) 0 ~ 1000 (corresponding to 100.0%) R/W
0x3014
Communication given point JOG
torque limit (PROFINET write data
invalid)
0 ~ 4000 (corresponding to 400.0%) R/W
0x3015
Communication given generation
torque limit (PROFINET write data
invalid)
0 ~ 4000 (corresponding to 400.0%) R/W
3.1.3 AC300 Communication Monitoring Function Code orAddress
Table 3.1.3 AC300 communication monitoring table
Parameter code
(address) Name Explain R/W
0x3002 Inverter status
Bit0 0: Shutdown state, 1: Running
state
R
Bit1 0: Non acceleration state, 1:
Acceleration state
Bit2 0: Non deceleration state, 1:
Deceleration state
Bit3 0: Forward, 1: Reverse
Bit4 0: No fault, 1: Inverter fault
Bit5 0: GPRS non lock, 1: GPRS lock
Bit6 0: No warning, 1: Inverter
warning
Bit7 0：No-ready, 1：Ready
Bit8
0: No fault in communication
with control board
1: Communication failure with
control board
0x3010 Fault code / warning code Please use c00.36 R

6
(address corresponding
function is invalid)
0x3018
External borrowing inverter
output terminal
(address corresponding
function is invalid)
Bit0: y terminal status
Bit1: relay status
Bit2: extended Y1 status
Bit3: extended relay status
R
0x3019
AO1 output (address
corresponding function is
invalid)
the analog output of external borrowing
frequency converter is 0-10000 R
0x301A
AO2 output (address
corresponding function is
invalid)
0 ~ 10000 R
C00.00(0x2100) Given frequency 0.01Hz R
C00.01(0x2101) Output frequency 0.01Hz R
C00.02(0x2102) Output current 0.1A R
C00.03(0x2103) Input voltage 0.1V R
C00.04(0x2104) Output voltage 0.1V R
C00.05(0x2105) Mechanical speed 1rpm R
C00.06(0x2106) Given torque 0.1% R
C00.07(0x2107) Output torque 0.1% R
C00.08(0x2108) PID given 0.1% R
C00.09(0x2109) PID feedback 0.1% R
C00.10(0x210A) Output power 0.1% R
C00.11(0x210B) Bus voltage 0.1V R
C00.12(0x210C) Module temperature 1 0.1 R
C00.13(0x210D) Module temperature 2 0.1 R
C00.14(0x210E) On state of input terminal X - R
C00.15(0x210F) On state of output terminal Y - R
C00.16(0x2110) AI1 analog input value 0.00%（0.001V）R
C00.17(0x2111) AI2 analog input value 0.00%（0.001V）R
C00.18(0x2112) Retain - R
C00.19(0x2113) Pulse signal PUL input value 0.001kHz R
C00.20(0x2114) Analog output AO1 0.01V/0.01mA/0.01kHz R
C00.21(0x2115) Analog output AO2 0.01V/0.01mA/0.01kHz R
C00.22(0x2116) Counter count value 1 R
C00.23(0x2117) Operation time of this power
on 0.1 hours R
C00.24(0x2118) Accumulated operation time
of the machine Hour R
C00.25(0x2119) Power level of frequency
inverter Kw(0.1Kw) R
C00.26(0x211A) Rated voltage of frequency
inverter V R

7
C00.27(0x211B) Rated current of frequency
inverter A(0.1A) R
C00.28(0x211C) Software version - R
C00.29(0x211D) PG feedback frequency 0.01Hz R
C00.30(0x211E) Timer timing time Second, minute, hour R
C00.31(0x211F) PID output value 0.1%（0.01%）R
C00.32(0x2120) Sub version of inverter
software - R
C00.33(0x2121) Encoder feedback angle 0.1° R
C00.34(0x2122) Accumulated error of Z pulse 1 R
C00.35(0x2123) Z pulse count 1 R
C00.36(0x2124) Warning code fault 0 ~ 63 fault number, 64 ~ 128 warning
number R
C00.37(0x2125) Accumulated power
consumption (low level) 1KWh R
C00.38(0x2126) Accumulated power
consumption (high level) 10000 KWh R
C00.39(0x2127) Power factor angle 1°(0.1°) R
3.2 AC310 Communication Configuration
3.2.1 Description ofAC310 Communication Configuration
Table 3.2.1 AC310 function code setting
Function
code Name Setting range Setting value Meaning
F01.01
Operation
command
selection
0: Keyboard given
1: Terminal setting
2: RS485
3: Purchase card given
4: Terminal switching command given
3
The running command is
given by AC300PN1
card
F01.02
Frequency
given source
channel
0: Keyboard number given
1: Keyboard analog potentiometer
setting
…
10: Purchase card
10
Frequency command is
given by AC300PN1
card

8
F01.11
Upper limit
frequency
source
selection
Select the given source of frequency
inverter upper limit
0: Upper limit frequency given
1: Reservation
2: Voltage analog VS given
3: Current or voltage analog AI given
4: Current analog AS given
5: Terminal pulse PUL given
6: RS485 communication given
7: Purchase card
-
If you use AC300PN1
card to limit the upper
limit frequency, you need
to set this to 7
F03.41
Torque
command
setting
0: Keyboard number
1: Keyboard potentiometer setting
…
7: Purchase card
-
If the torque command is
to be given by
AC300PN1 card, it is set
to 7
F03.54
Speed limit
selection of
forward
rotation in
torque control
0: Set by function code F03.56
1: Reservation
…
7: Purchase card * F03.56
-
If you need to limit the
speed through the
AC300PN1 card, you
need to set this to 7
F03.55
Speed limit
selection of
reverse rotation
in torque
control
0: Set by function code F03.57
1: Reservation
…
7: Purchase card * F03.57
-
If you need to limit the
speed through the
AC300PN1 card, you
need to set this to 7
F03.56
Maximum
forward speed
when
controlled by
torque
0.0%～100.0% -
Relative maximum
output frequency
(F01.10)
F03.57
Maximum
reverse speed
when
controlled by
torque
0.0%～100.0% -
Relative maximum
output frequency
(F01.10)
F12.32
Treatment of
disconnection
between PN
card and
inverter
0: No detection
1: Alarm and freely stop
2: Warn and continuously run
Treatment method of
AC300PN1 card after
detection of
disconnection with
control board (Ebus4/A.
buS)
F12.43
Master slave
communication
failure action
0: No detection
1: Alarm and freely stop
2: Warn and continuously run
-
Handling mode in case
of master-slave
communication failure

9
(when PLC is
disconnected from
equipment or PLC is in
stop state, Ebus3/A. buS
is reported)
F12.50
Processing
method of
communication
disconnection
of expansion
card (frequency
inverter
processing)
Ones place: EX-A breaking treatment
Tens place: EX-B breaking treatment
0: No detection
1: Alarm and freely stop
2: Warn and continuously run
-
Processing mode
selection in case of
communication failure
between AC300PN1 card
and frequency inverter,.
(frequency inverter self
detection, reporting
Ebus1/A. buS)
3.2.2Address Description ofAC310 Communication Control Group
Table 3.2.2 Address description of AC310 communication control group
Address
definition Function description Explanation of data significance R/W characteristic
0x3100 Communication given frequency 0.01 Hz, e.g.: 5000 corresponds to
50Hz R/W
0x3101 Communication command setting
0: No command
1: Forward running
2: Reverse running
3: Forward jog
4: Reverse jog
5: Slow down and stop
6: Freely stop
7: Fault reset
8: Run forbidden command
9: Run allow command
R/W
0x3104 Communication given upper limit
frequency Unit: 0.01Hz R/W
0x3105 Communication torque setting Unit 0.1% R/W
0x3106 Maximum forward frequency limit of
torque control Unit 0.1% R/W
0x3107 Maximum reverse frequency limit of
torque control Unit 0.1% R/W
0x3108 Communication given PID setting
value Unit 0.1% R/W
0x3109 Communication given PID feedback
value Unit 0.1% R/W
0x310A voltage setting of voltage frequency
separation Unit 0.1% R/W
0x310B Tension setting 0 ~ maximum tension R/W

10
0x310C Coil diameter setting 0 ~ maximum coil diameter R/W
0x310D Linear speed setting 0 ~ maximum linear speed R/W
0x310E Acceleration time 1 Set unit by function code F01.21 R/W
0x310F Deceleration time 1 Set unit by function code F01.21 R/W
0x3111 Torque current component 0 ~ 4000 (corresponding to 0.0% ~
400.0%) R/W
0x3112 Torque filtering time 0 ~ 6000 (corresponding to 0.000s-
6.000s) R/W
0x3113 Tension PID feedback 0 ~ 1000 (corresponding to 0.0% ~
100.0%)
R/W
0x3114 Communication given torque limit in
jog state
0 ~ 4000 (corresponding to 0.0% ~
400.0%)
R/W
0x3115 Communication given torque limit in
generation state
0 ~ 4000 (corresponding to 0.0% ~
400.0%)
R/W
3.2.3 AC310 Communication Monitoring Function Code OrAddress
Table 3.2.3 AC310 communication monitoring table
Parameter code
(address) Name Explain R/W
0x3102 Inverter status
Bit0 0: Shutdown state, 1: Running
state
R
Bit1 0: Non accelerated topic, 1:
Accelerated state
Bit2 0: Non deceleration state, 1:
Deceleration state
Bit3 0: Forward, 1: Reverse
Bit4 0: No fault, 1: Fault
Bit5 0: GPRS non lock, 1: GPRS
lock
Bit6 0: No warning, 1: Warning
Bit7 0：No-ready，1：Ready
Bit8
0: No fault in communication
with control board
1: Communication failure with
control board
0x3010 Fault code / warning code (address
corresponding function is invalid) please use c00.36 R
0x3018
External borrowing inverter output
terminal
(address corresponding function is
invalid)
Bit0: y terminal status
Bit1: relay status
Bit2: extended Y1 status
Bit3: extended relay status
R
0x3019 AO1 output (address corresponding
function is invalid)
the analog output of external borrowing
frequency converter is 0-10000 R

11
0x301A AO2 output (address corresponding
function is invalid) 0 ~ 10000 R
C00.00(0x2100) Given frequency 0.01Hz R
C00.01(0x2101) Output frequency 0.01Hz R
C00.02(0x2102) Output current 0.1A R
C00.03(0x2103) Input voltage 0.1V R
C00.04(0x2104) Output voltage 0.1V R
C00.05(0x2105) Mechanical speed 1rpm R
C00.06(0x2106) Given torque 0.1% R
C00.07(0x2107) Output torque 0.1% R
C00.08(0x2108) PID given 0.1% R
C00.09(0x2109) PID feedback 0.1% R
C00.10(0x210A) Output power 0.1% R
C00.11(0x210B) Bus voltage 0.1V R
C00.12(0x210C) Module temperature 1 0.1 R
C00.13(0x210D) Module temperature 2 0.1 R
C00.14(0x210E) Input terminal X On state - R
C00.15(0x210F) Output terminal X on state - R
C00.16(0x2110) AI1 analog input value 0.00%（0.001V）R
C00.17(0x2111) AI2 analog input value 0.00%（0.001V）R
C00.18(0x2112) Retain - R
C00.19(0x2113) Pulse signal PUL input value 0.001kHz R
C00.20(0x2114) Analog output AO1 0.01V/0.01mA/0.01kHz R
C00.21(0x2115) Analog output AO2 0.01V/0.01mA/0.01kHz R
C00.22(0x2116) Counter count value 1 R
C00.23(0x2117) Operation time of this power on 0.1 hour R
C00.24(0x2118) Accumulated operation time of the
machine hour R
C00.25(0x2119) Power level of frequency inverter Kw(0.1Kw) R
C00.26(0x211A) Rated voltage of frequency inverter V R
C00.27(0x211B) Rated current of frequency inverter A（0.1A）R
C00.28(0x211C) Software version - R
C00.29(0x211D) PG feedback frequency 0.01Hz R
C00.30(0x211E) Timer timing time Second, minute, hour R
C00.31(0x211F) PID output value 0.1%（0.01%） R
C00.32(0x2120) Sub version of inverter software - R
C00.33(0x2121) Encoder feedback angle 0.1° R
C00.34(0x2122) Accumulated error of Z pulse 1 R
C00.35(0x2123) Z pulse count 1 R
C00.36(0x2124) Warning code fault 0 ~ 63 fault number, 64 ~ 128 warning
number R
C00.37(0x2125) Accumulated power consumption
(low level) 1 KWh R

12
C00.38(0x2126) Accumulated power consumption
(high level) 10000 KWh R
C00.39(0x2127) Power factor angle 1°, 0.1° R
3.3 Description of Communication Configuration between AC300PN1 Card and
PROFINET Master Station
After the communication between the main station and the main station is set up correctly, the
communication between the main station and the main station can be realized by setting the
communication card with the main station. Taking AC310 as an example, after the communication
between AC300PN1 card and AC310 inverter is realized, it is necessary to connect with PROFINET
master station correctly. After setting relevant configuration, the communication between
AC300PN1 card and master station can be realized.
3.3.1 PROFINET Wiring Diagram
PROFINET supports a variety of connection modes. Through reasonable use of switches, different
networking modes can be realized, as shown in the figure below
PROFINETmas t er
station
1 2
AC300P N1slave
stationn
...
AC300P N1slave
station1
AC300P N1slave
station2
CN2 CN1 CN2 CN1 CN2 CN1
Figure 3.1 Schematic diagram of string connection
...
Networkswitch
1 2 n
...
3
AC300P N1slave
station1
AC300P N1slave
station2
AC300P N1slave
stationn
PROFINETmast er
station
1 2
CN2 CN1 CN2 CN1 CN2 CN1
Figure 3.2 Schematic diagram of star connection

13
PROFINETmat er 
station
1 2
AC300P N1slave
station1
Networkswitch1
1 2 n
...
AC300P N1slave
station2
Networkswitch2
1 2 3
Networkswitch3
123
AC300P N1slave
station3
AC300P N1sl ave
station4
AC300P N1sl ave
station5
AC300P N1slave
station6
CN2 CN1 CN2 CN1
CN2 CN1 CN2 CN1 CN2 CN1 CN2 CN1
Figure 3.3. Schematic diagram of connection tree
3.3.2 communication description
AC300PN1 card requires customers to select different PZD lengths for transmission according to
different requirements. Users can select the corresponding functions of each PZD in the
configuration. The functions supported by each data format are shown in the table below
Table 3.3 data format description
Data type Data length Supported features
Standard telegram 1 PZD-2/2
Frequency inverter command and frequency setting
Operation status and frequency feedback of frequency
inverter
Standard telegram 2 PZD-4/4
Frequency inverter command and frequency setting
0 ~ 2 function parameters are written periodically
Operation status and frequency feedback of frequency
inverter
0 ~ 2 monitoring parameters are read periodically
Standard telegram 3 PZD-6/6
Frequency inverter command and frequency setting
0 ~ 4 function parameters are written periodically
Operation status and frequency feedback of frequency
inverter
0 ~ 4 monitoring parameters are read periodically
Standard telegram 4 PZD-8/8
Frequency inverter command and frequency setting
0 ~ 6 function parameters are written periodically
Operation status and frequency feedback of frequency
inverter

14
0 ~ 6 monitoring parameters are read periodically
Standard telegram 5 PZD-10/10
Frequency inverter command and frequency setting
8 ~ 0 cycle write function
Operation status and frequency feedback of frequency
inverter
0 ~ 8 monitoring parameters are read periodically
Standard telegram 6 PZD-12/12
Frequency inverter command and frequency setting
0 ~ 10 function parameters are written periodically
Operation status and frequency feedback of frequency
inverter
0 ~ 10 monitoring parameters are read periodically
PZD is the process data. The master station of PZD can send instructions to the frequency inverter
periodically and read the current status of the frequency inverter periodically. Each PZD can select
configuration and select the parameters to be interacted between the master station and the slave
station. PZD1 and PZD2 are fixed configuration and cannot be modified. The configuration of PZD3
~ PZD12 can be changed according to the specific needs of users. The interactive data is shown in
table 3.5
Table 3.4 Description of PZD interactive data
PZD（Master->Slave）
PZD1 PZD2 PZD3～PZD12
Inverter command Frequency command of frequency
inverter
Other frequency inverter function
parameters
PZD（Slave->Master）
PZD1 PZD2 PZD3～PZD12
Inverter status Frequency feedback of frequency
inverter
Other monitoring parameters
Table 3.5 Description of data sent by master station
Master station sends data
PZD1 Inverter control command
0: No command
1: Forward running
2: Reverse running
3: Forward jog
4: Reverse jog
5: Slow down and stop
6: Freely stop
7: Fault reset
8: Run forbidden command
9: Run allow command
PZD2 Frequency command of frequency inverter, unit: 0.01Hz
PZD3～PZD12 It can be configured with different control parameters (0x3xxx group address) to issue
periodic instructions to the frequency inverter
Table 3.6 Description of data sent by slave station
Sending data from slave station
PZD1 Bit0 0: Shutdown state, 1: running state
Bit1 0: non accelerated state, 1: accelerated state
Bit2 0: non deceleration state, 1: deceleration state
Bit3 0: forward, 1: reverse

15
Bit4 0: no fault, 1: fault
Bit5 0: GPRS unlock, 1: GPRS lock status
Bit6 0: no warning, 1: warning
PZD2 Frequency feedback of frequency inverter, unit: 0.01Hz
PZD3～PZD12 It can be configured for different monitoring parameters (C00.xx group and part of 0x300
group address) to read data periodically from frequency inverter

16
4 S7-1200 Configuration AC300PN1 Card Example
The following shows that S7-1200 is used with V15 to show how to configure with AC310 and
AC300PN1 card.
Step 1: Build a new project and add S7-1200 master station
Open the software and click create new project.
Click to configure the device

17
Click add equipment, select the corresponding model of PLC, and click Add.
Fill in the project information, project name, path, etc. When finished, click to create.

18
Step 2: import the GSDML file
In "options", click "manage general station description file"
In the pop-up dialog box, first select the path where the GSDML file is stored (be careful not to put
the GSDML file in the Chinese path, otherwise an error may be reported), and then select and click
Install. The GSDML file can be obtained from the manufacturer or the official website

19
If the installation is successful, you will be prompted as follows. Click "close"
Step 3: configure the slave information
Double-click devices and networks in the project
Find "other field devices" - "PROFINETIO" - "I/O" - "AC310" - "AC310PN" under the "hardware
directory" on the right, and double-click "Standard, MRP"

20
Select the Ethernet port of PLC, switch to "properties" – “Ethernet address”, set IP address and
subnet mask, and click "add subnet"
Click "unassigned" of AC310PN, and click "PLC_1. PROFINET interface_1"
Select the slave station, click "properties" - "Ethernet address", and set the IP address of the slave
station. Under "PROFINET", tick off "automatically generate PROFINET device name", and
enter the desired name (you can also keep the check box to let the system automatically generate
the name)