Topic: DMD0440
Module Configuration for BX-04DA-1 and BX-08DA-1 Current Output Modules
When a Do-more CPU powers up and detects a new BX-04DA-1 or BX-08DA-1 module it will automatically create a module configuration and assign the required I/O mapping using the first 4 or 8 available WY (32-bit signed integer) locations and first 24 available X (input bit) locations required by the module.
The default configuration has all of the channels enabled in 4-20mA mode with scaling disabled. Clicking the Edit Config button in the Module Configuration utility will open the following dialog where the default configuration can be changed.
The Global Settings tab for this module sets the following options that apply to the module as a whole, or to all of the channels on the module:
The Module Configuration group:
Name is a name assigned to the module, The default name is the module's part number followed by the slot number where it currently is located. The default name can be changed if required.
Info shows the part number, the number of the controlling I/O Master, and the slot number where the module is located.
The Global Settings group:
Channels Enabled selects how many of the module's available channels will have an output attached. Channels are enabled in order starting with the first channel.
The Global Status Bits group shows the X bit locations the module uses to indication module-wide errors:
Self Test Failed indicates the module did not pass its power-on self test.
Missing 24V indicates the required external 24 VDC power is not connected.
Data Not Valid indicates the proper module configuration was not written to the module at power-up, or that the module lost it's configuration at runtime (probably due to extreme noise).
The Analog Outputs 1-4 and Analog Outputs 5-8 (if available) tabs set the following options that are specific to the individual channels:
Analog Output # selects the output current range, either 0 - 20mA or 4 - 20mA.
The default range of values for analog outputs is -32768 to +32767. Because current outputs are inherently unipolar, the default bipolar range setting will yield values of 0 - 32767. Each channel can be optionally configured to use the full range of 65535 counts with the Enable 16 bit Unipolar Mode selection. The one caveat with this selection is that any time you reference the raw value in WY# you must also use the ":U" cast operator to get the correct value.
The WY# group shows the range of values, the Units / Count of the raw output value, and the bit memory locations for the Broken Transmitter indication.
The RY# group (if automatic scaling is enabled for this channel) shows the Real numeric memory location where the engineering unit value is stored in the CPU, the range of potential values and the Units / Count based on the current scale factors.
Enable Scaling from RY# to WY# enables the automatic scaling of the engineering units (32-bit real) to raw output value (32-bit signed integer).
RY# Min / RY# Max contains the minimum and maximum values for the engineering units.
WY# Min / WY# Max the minimum and maximum raw values determined by the Analog Output # selection.
Counts / mA displays the WX#'s Min and Max values in terms of the range of counts or the range of milliamps.
Clamp WY# (if enabled) and the calculated scaled value is lower than WX # Min or higher than WX# Max, the specified Min and Max values will be used.