Configuration of Modicon MC80 Processors
 
About us
Enable MC80
The following table describes the steps to enable MC80 in Unity Pro 8.1 or later:
Step
Action
1
Install Unity 8.1 or later.
2
Install the Hot fix:
UnityPro_V81_HF_MC80
3
Create a new project with MC80.
Access to the Configuration Screen
The following table describes the steps to access the configuration screen:
Step
Action
1
Select the processor.
2
Using the contextual menu, click Open.
3
Select the Configuration tab.
Configuration of the Processor
NOTE: You can modify the parameters of this dialog box only in offline mode.
The following screen shows the MC80 CPU configuration screen:
CAUTION
LOSS OF DATA ON APPLICATION TRANSFER
Press the RESET button on the power supply. Otherwise, %MWi is reset and initial values are loaded.
Failure to follow these instructions can result in injury or equipment damage.
In the configuration screen, proceed with the following steps:
Step
Action
1
Enable the Run/Stop input option, if required.
Do not enable this option if the associated discrete input is mapped because this inhibits the PLC start-up.
2
Enable the Memory protect option, if required.
The protection is activated by an input bit. It prohibits the transfer of a project into the PLC and modifications in online mode, regardless of the communication channel. The Run and Stop commands are authorized.
3
Enable the Automatic start in Run option, if required.
4
Confirm whether the internal words %MWi are to be initialized on cold start triggered by software (application download, initialize command, restore command, %S0 activation, cold start button on the PLC screen) or not. By checking the box, the PLC writes the initial values to %MWI.
5
Enable the Cold Start Only option, if required.
6
In the Size of global address fields of the dialog box define for the application the number of internal bits %M.
7
Define the number of internal words %MW.
8
Define the number of constants %KW.
The following table shows the different elements of configuration screen and their functions:
Element
Function
Operating mode
Operating mode
Operating mode zone includes the following elements:
  • Run/Stop input
  • Memory protect
  • Automatic start in Run
  • Initialize %MWi on cold start
  • Cold Start Only
Run/Stop
Run/Stop input can be:
  • the image value of a physical digital input: MOD_DIS_16_1.DIS_CH_IN[i].VALUE, where i = number from 0…7
  • an unlocated variable of type BOOL with correct RW Program (for example, MyRunStop1)
  • an unlocated variable of type EBOOL with correct RW Program (for example, MyRunStop2)
The Run/Stop by input only parameter is significant only if the Run/Stop input is valid.
If the Run/Stop by input only is unchecked
it is possible to change the PLC state from Run to Stop (or the opposite) either with a Run/Stop Request or by changing the value of the Run/Stop input.
If the Run/Stop by input only is checked
it is only possible to change the PLC state from Run to Stop (or the opposite) by changing the value of the Run/Stop input.
NOTE: Before downloading a different application, reset the Run/Stop input to 0 or press the reset button.
Memory protect
Memory protect follows the same rules as Run/Stop input.
When you configure and enable memory protect, you cannot change the PLC configuration or application and upload the application.
Initialize %MWi on cold start
On a cold start or on download if you check the box (default state)
the %MWi are handled like other global variables (initialized to 0 or initial value, according to current application) in all cold start cases.
On cold start or on download if you uncheck the box
if %MW were previously saved in internal flash memory (using the %SW96 word) they are restored from internal flash memory
if not,
  • if cold start is linked to a push on the reset button, the %MW are initialized.
  • if not, the current values of %MW are maintained.
NOTE: if the new (or restored) application has more %MW than the previous one, the added %MW are set to 0 (non-zero initial values are not applied).
Cold Start Only
If checked, this option forces the cold start of the application, instead of the normal warm start.
By default, the Cold Start Only option is unchecked.
An application using this functionality is not:
  • downloadable on a PLC with a previous version,
  • executable on a PLC with a previous version.
If cold start only is checked and run/stop is configured on unlocated variable, then the PLC will restart in run or stop, depending on an initial value of the variable. It does not restart in the same state as before.
Memory Management
Memory Management
It includes the Size of global address fields (%M, %MW, %KW, %S, %SW)
CAUTION
UNINTENDED EQUIPMENT OPERATION
At the end of download, the PLC starts automatically if the default value of a user-defined unlocated Run/Stop variable is 1.
Failure to follow these instructions can result in injury or equipment damage.