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