2 Functions of Devices in DVP-PLC 4. See Chapter 2.13 for error codes for syntax check. Function Group Data Backup Memory Number M1005~M1007 Contents: When the data backup memory card is installed in EH2 MPU, MPU will operate according to the On/Off of switch on the card. If the switch is “On”, the following comparisons will be conducted and the card will be copied to MPU. If the switch is “Off”, MPU will not perform any action. 1. M1005 = On: An error occurs in the comparison between the ciphers of MPU and the data backup memory card 2. M1006 = On: The data backup memory card has not been initialized. and MPU does not perform any action. 3. M1007 = On:
Data in the program area of the data backup memory card do not exist, it means data doesn’t exist in the program area of data backup memory card. Function Group Scan Time-out Timer Number M1008, D1008 Contents: 1. M1008 = On: Scan time-out occurs during the execution of the program, and PLC ERROR LED indicator remains beaconing. 2. Users can use WPLSoft, ISPSoft, or HPP to monitor the content (STEP address when WDT timer is “On”). Function Group Checking Lost PLC SRAM Data Number D1009, M1175, M1176 Contents: 1. bit0 ~ bit7 record the types of data lost. bit = 1 refers to losing data; bit = 0 refers to correct data. 2. What are lost 3.
After the PLC is powered, the data in SRAM will be verified. If the SRAM data are lost, the PLC will record the error in D1009 and set on M1175 or M1176 according to the content of the data. Function Group Scan Time Monitor Number D1010 ~ D1012 Contents: The present value, minimum value and maximum value of scan time are stored in D1010 ~ D1012. 1. D1010: Present scan time value 2. D1011: Minimum scan time value 3. D1012: Maximum scan time value DVP-PLC Application Manual 2-73 bit8 ~ 15 bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0 Reserved PLC program D register T register C register File register M relay S step password