GE VersaMax PLC

11 The Service Request Function
This chapter explains the Service Request (SVCREQ) function, which requests a special
PLC service. It describes SVCREQ parameters for the VersaMax CPU.
• SVCREQ Function Numbers
• Format of the SVCREQ Function
• SVCREQ 1: Change/Read Constant Sweep Timer
• SVCREQ 2: Read Window Times
• SVCREQ 3: Change Programmer Communications Window Mode
• SVCREQ 4: Change System Communications Window Mode
• SVCREQ 6: Change/Read Number of Words to Checksum
• SVCREQ 7: Read or Change the Time-of-Day Clock
• SVCREQ 8: Reset Watchdog Timer
• SVCREQ 9: Read Sweep Time from Beginning of Sweep
• SVCREQ 10: Read Folder Name
• SVCREQ 11: Read PLC ID
• SVCREQ 13: Shut Down (Stop) PLC
• SVCREQ 14: Clear Fault
• SVCREQ 15: Read Last-Logged Fault Table Entry
• SVCREQ 16: Read Elapsed Time Clock
• SVCREQ 18: Read I/O Override Status
• SVCREQ 23: Read Master Checksum
• SVCREQ 24: Reset Ethernet Daughter Board
• SVCREQ 26/30: Interrogate I/O
The Service Request Function GFK-1503E User Manual 195
For public disclosure