bs1200 1.3.6

Python interface to the Bloomy BS1200. Supports driver communication via PCAN-USB interface, and Configuration via Ethernet connection

Bloomy Battery Simulator 1200 Python Driver

This package enables CAN communication to the Bloomy BS1200 through the PEAK Systems PCAN-USB FD adapter. To install latest public version use the command 'pip install bs1200' To install via downloaded distributable open a command line in the dist directory and use the command 'pip install bs1200-X.X.X-py3-none-any.whl' where X.X.X is version of whl file. Package is compatible with Windows and Unix platforms Requires Python version 3.6 or greater

Feature list

• Instantiate a CAN Bus supporting up to 16 Parallel BS1200 units

• HIL Mode Configuration : When in HIL mode, the Battery Simulator 1200 gives priority to the specified incoming frames to reduce latency; the instrument will attempt to pass non-HIL frames through for processing but delivery is not guaranteed. Before using, the CAN HIL Publishing Configuration must be set.

• Query BS1200 for board Temperatures and Fan Faults

• Individual Cell Control

  • Enable or Disable Cell
  • Set Cell Voltage
  • Readback Cell Voltage
  • Set Cell Sinking and Sourcing Current Limits
  • Readback Cell Current
  • Readback Cell Current

• Enable/Disable all Cells

• Set all Cell Voltages

• Readback all Cell Voltages

• Set all Cell Sinking & Sourcing Limits

• Readback all Cell Currents

• Format strings for cell readbacks console printing

• Set Voltages for Analog Output Channels 1-2

• Readback Analog Input Channel

• Readback All Analog Input Channels

• Set direction and enable status for Digital Input/Output Channels 1-8

• Readback DIO Channels

Upcoming/Planned Features

• NI-XNET (CAN) USB adapter support
• Ethernet (TCPIP/UDP) support

Installation

Install the package by saving the .whl file from the project releases page https://github.com/BloomyControls/BS1200-Python-Driver/releases/ Open command line, powershell, or another terminal to the location the .whl file was saved and run the following command to install using pip package manager Windows:

pip install "\path\to\whl\file\BS1200_driver-X.X.X-py3-none-any.whl"

Linux:

pip3 install "/path/to/whl/file/BS1200_driver-X.X.X-py3-none-any.whl"

Alternative to downloading a release, the library may be built to the project /dist/ directory by running the command

python -m build

from the same directory the project's pyproject.toml file is found, and install using pip from the freshly built .whl in the /dist/ directory.

Use Instructions

Once the package has been installed to the python environment, the BS1200 driver class may be used to communicate action statuses with target BS1200 units over a PCAN adapter, or to configure settings for a BS1200 at a designated IP address using the ConfigTools class.

BS1200 (driver)

The only required argument to the BS1200 class constructor is an integer list of the Box IDs the connected BS1200 units are configured to i.e.

from bs1200 import BS1200

test_unit = BS1200([1])
test_unit.query_system_status(1)
test_unit.close()

An equivalent statement using the Python 'with' structure can be used for the driver so that the communication session will be closed out automatically:

from bs1200 import BS1200

with BS1200([1]) as bs:
     bs.query_system_status(1)

Examples above are for a CAN Bus with a single BS1200 with the CAN Box ID set to 1. Once the object is created, the PCAN bus is initialized and a communication session using the device channel PCAN_USBBUS1 has started.

The BS1200 Driver class has three optional arguments used to set the PCAN Bus configuration other than the listed default values:

pcan_channel = 'PCAN_USBBUS1', 
bit_rate = 1000000, 
delay_ms = 10

Where pcan_channel is the name of the PCAN Interface on the system, bit_rate is the CAN Baud Rate (must match CAN Baud Rate configured on BS1200!!!), and delay_ms is delay in milliseconds that will be executed by the can_wait() class method.

The aforementioned method is a public helper method that may be called explicitly, or optionally by providing a True value for the wait argument of action status methods which assign voltage or current setpoints. It is reccomended to wait the default value of 10 ms between sending new setpoints to the BS1200 and querying readback of cell values, so that updated CAN frames will be recieved to the cache of incoming frames. This delay value is closely tied to the Write_Period_ms property of the BS1200 configuration's CAN_Settings.

Action Status Methods

The following action status methods may then be used to interact with the BS1200 bus:

Driver Method Name	Parameters	Description
query_system_status	boxid (int): Box ID of the queried unit	Returns printed statements for the unit's fan statuses and temperature sensor readings
hil_mode	boxid (int): Box ID of the target unit enable_HIL (bool): True to enable HIL Mode, False to disable	Enable or disable the BS1200 in HIL mode. Returns PCAN bus OK status. Once set, the Battery Simulator will execute only the commands defined as active in HIL mode. By default all auxiliary configuration channels are set to disabled during HIL mode. In order to change this option, the configuration frame must be used. Note, the Configure frame is not supported in HIL mode, so this must be sent while HIL mode is disabled.
config_can_publishing	boxid (int): Target BS1200 unit dio_en (bool): Enable/Disable (True/False) digital IO publishing in HIL mode ao_en (bool): Enable/Disable (True/False) analog publishing in HIL mode ai_en (bool): Enable/Disable (True/False) analog output publishing in HIL mode	Sends the configuration frame for CAN publishing in HIL Mode. The Configure frame is not supported in HIL mode, so this must be sent while HIL mode is disabled.
cell_enable	boxid (int): Target BS1200 unit channel (int): Cell channel to enable/disable status (bool): Enter 'true' to enable, 'false' to disable wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Enable or disable a cell channel on the target BS1200 unit. Enter 'true' to enable, 'false' to disable, valid channel values 1-12
cell_enable_all	boxid (int): Target BS1200 unit status (bool): Enter 'true' to enable, 'false' to disable wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Enable or disable all channels for a target BS1200 unit.
set_cell_V	boxid (int): Target BS1200 unit channel (int): Cell channel for voltage setpoint voltage (float): voltage level to set the designated cell wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Set an individual cell (1-12) to designated voltage value input range 0.00 to 5.00 Volts
set_V_all	boxid (int): Target BS1200 unit tgt_volt (float): Target voltage to set all cell channels wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Set the cell voltage for Cells 1-12, valid inputs from 0.00 to 5.00 Volts
readback_cell_V	boxid (int): Target BS1200 unit channel (int): Cell channel to readback (1-12)	Readback voltage value of designated cell channel 1-12, returns float value.
readback_V_all	boxid (int): Target BS1200 unit	Return list of voltage values (V) for all cell channels.
set_cell_I_sink	boxid (int): Target BS1200 unit channel (int): Cell channel for target setpoint (1-12) sink_current (float): Target cell current sinking limit (valid values 0-0.5A) wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Construct and send message to set an individual cell current sinking value
set_cell_I_source	boxid (int): Target BS1200 unit channel (int): Cell to set sourcing current limit of source_current (float): Target cell current sinking limit (valid values 0-0.5A) wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Construct and send message to set an individual cell current sourcing value
set_I_all	boxid (int): Target BS1200 unit sink_i (float): Sinking current for all cells, Valid in range 0-0.5 A source_i (float): Sourcing current for all cells, Valid in range 0-0.5 A wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Set the sink and sourcing current limits for all cells. Valid in range 0-0.5 A
readback_cell_I	boxid (int): Target BS1200 unit channel (int): Target cell channel	Return the current readback (A) for the designated cell channel (1-12)
readback_I_all	boxid (int): Target BS1200 unit	Return current readbacks (A) for all cell channels 1-12 as a list of floats
readback_ai_v	boxid (int): Target BS1200 unit channel (int): Target analog input channel	Returns the voltage level for the target Analog Input Channel (valid channels 1-8)
readback_ai_all	boxid (int): Target BS1200 unit	Returns the voltage levels for Analog Input Channels 1-8 as an array of float values
ao_set	boxid (int): BS1200 unit to set analog outputs for AO1_Voltage (float): voltage setpoint for AO 1 (0-5V) AO2_Voltage (float): voltage setpoint for AO 2 (0-5V) wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Set the BS1200's Analog Output voltage setpoints. Valid range from 0-5 V.
dio_set	boxid (int): Target BS1200 unit dio_dir (list[int]): List of Boolean values designating direction of each DIO Channel. Set 1 to configure as Output, 0 to configure as Input. dio_en (list[int]): Enables the DIO line when the direction is also set as output (True) wait (bool): Defaults to False. Provide True to method call to execute call to can_wait() before returning from this method	Set the direction of Digital IO Channels 1-8.
readback_dio	boxid (int): Box ID of unit to read DIO from	Returns state of Digital Input/Output Lines as a list of booleans
can_wait	N/A	Executes time.sleep() with the configured millisecond delay configured by delay_ms (Default Value of 10 ms). This method is called when the wait argument for setpoint action status methods is set to True, or may be called explicitly after a series of setpoint method calls. This method or some other means of delay should be used between the setpoint and readback of cell values

Format Strings

Three format strings v_fmt_txt, i_fmt_txt, and ai_fmt_txt are defined as class properties to provide clean console or text file outputs of cell voltage, current, and analog input voltage numeric arrays respectively. For example, with a BS1200 object named bs that is connected to a BS1200 with BoxID 1, the cell voltages may be printed to console (or written to log/report text file) using the following:

volts = bs.readback_V_all(1)
print(bs.v_fmt_txt.format(*volts))

To print a tabulated string output such as:

Cell 1: 1.002400 V |  Cell 2: 1.000800 V |  Cell 3: 0.998400 V | Cell 4:  0.000000 V
Cell 5: 0.000000 V |  Cell 6: 0.000000 V |  Cell 7: 0.000000 V | Cell 8:  0.000000 V
Cell 9: 0.000000 V | Cell 10: 0.000000 V | Cell 11: 0.000000 V | Cell 12: 0.000000 V

ConfigTools

The features of the configuration mode seen in the BS1200 Soft Front Panel are available as a module of the b1200 python driver. This module allows you to view and alter the Protocol, Ethernet, and CAN configurations for an individual BS1200 unit. The configuration tools can be used with the following import statement

from bs1200 import ConfigTools

To apply individual categories can be used by importing the dataclasses used for each type of configuration

from bs1200 import ConfigTools, Ethernet_Settings, CAN_Settings, Protocol

By just importing the ConfigTools configuration settings may be read as a json object (optionally to a .json file) using get_all_settings(ExportToFile: bool) and apply_config_file(cfg_file_path: str). BS1200 Configuration JSON object example:

{
    "Protocol": "CAN",
    "IP_Address": "192.168.1.100",
    "Ethernet_Settings": {
        "TCP_Cmd_Port": "12345",
        "TCP_Cmd_Interval_ms": "10",
        "UDP_Read_Port": "54321",
        "UDP_Read_Interval_ms": "5"
    },
    "CAN_Settings": {
        "Box_ID": 1,
        "Write_Period_ms": 5
    },
	"Enable_SafetyInterlock" : false
}

By default the methods used to set configuration values will restart the connected target using the NI System Configuration API. It is highly reccomended to restart the unit whenever updating values to prevent a desynchronization between the target IP address saved to class properties and currently used IP address of the device. When restarting the target BS1200, the console will output status messages while the module waits for the nisyscfg restart method to return, signalling that the target is back online. The ConfigTools object will update to the newly set IP address so that further configuration may take place without needing to recreate the object.