Configuration software is used to display and modify the characteristics of the CPU (such as the time-of-day clock, SNP ID, memory configuration, and fault category). “CPU Configuration,” explains how to complete the CPU configuration for your system. This will set up or change the system features described below.
PLC Time and Date
The PLC maintains the current time and date. These settings can be displayed and changed using the CPU configuration function.
SNP ID
For multidrop configurations, each CPU connected to the system must have a unique identification name. The current SNP ID can be displayed and changed using the CPU configuration function.
PLC Memory Configuration
You can show the recently memory allocated to both discrete references and register references. In addition, you can change the amount of program logic memory used for analog I/O and register memory.
System Response to Faults
To ensure safe operation of the Control System, the PLC must be able to respond appropriately to certain types of faults. Fatal faults cause the CPU to set fault references and then go to STOP mode. Diagnostic faults cause the CPU to set fault references, but the PLC keeps operating. For many faults, the default action (fatal or diagnostic) can be configured to suit the needs of the application.
I/O Configuration
The I/O configuration function is used to describe the modules that are present in the PLC racks, to assign logical addresses, and select options for individual modules. These addresses of logical are independent of physical location or function. “I/O Configuration,” explains how to complete the I/O configuration for your system.
The I/O configuration rack screen represents the appearance of the Series 90-70 I/O rack. Use the Next and Previous page keys, or the Up and Down cursor keys, to display another rack. Then, use the Right and Left cursor keys to move the cursor to the slot to be displayed or configured. To complete the I/O configuration:
1. Select the module present in each slot.
2. Assign each module a reference address. The configuration software automatically supplies the next highest reference address for each module; however, you can change this address.
3. For some modules, you can also select options, such as the configuration mode for a Programmable Coprocessor Module. Editing features make it easy to copy, move, replace, delete, or undelete configurations.