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Setting And Reading The Real Time Clock Through Modbus:
Modbus registers 40007 through 400013 are real time clock read registers as seen in figure 1.3. To set the clock current values
must be entered into registers 40014 through 40020. Any of these registers left to zero will result in an incorrect clock setting.
Once desired clock date and time values are entered bit 0 of register 40001 must be toggled for the controller to accept the values.
This can be done by setting bit 0 high or writing a 1 to register 40001. The controller will then accept the new values.
Figure 1.3
Miscellaneous Floating Point and Integer Readings:
Battery voltage and amperage along with engine run hours, system pressure, system start pressure, time until start, time until stop
and engine starts can all be read from the controller Real or Floating Point registers. These are Modbus registers 40021 through
40037. These registers are word or double word. All available floating point and integer registers are shown in Figure 1.4 and do
not require scaling.
Figure 1.4
No more than 50 registers can be polled at a time.
Historical Alarms and Events:
The historical events and alarms can be viewed from Modbus registers 40107 through 40114. Here it is possible to scroll through
the entire log and set the log pointer to the most current record. Register 40107 contains a number representing the actual log
number entry location in the controller. Register 40108 contains a number representing the event or alarm that can be indexed
using figures 1.6 through 1.9. Registers 40109 through 40114 show the date and time stamp information for the log record being
pointed to.
To maneuver through the log:
Toggling bit 3 or writing an 8 to register 40001 will increment the log by one entry.
Toggling bit 4 or writing a 16 to register 40001 will decrement the log by one entry.
Toggling bit 7 or writing a 128 to register 40001 will set the log to view the most current log entry.
Description Modbus Registers Usage Notes For Read Only Registers
Real Time Clock Month 040007 PLC Read Real Time Clock Month 1-12
Real Time Clock Day 040008 PLC Read Real Time Clock Day 1-31
Real Time Clock Year 040009 PLC Read Real Time Clock Year 00-99
Real Time Clock Hour 040010 PLC Read Real Time Clock Hour 1-24
Real Time Clock Minute 040011 PLC Read Real Time Clock Minute 0-59
Real Time Clock Second 040012 PLC Read Real Time Clock Seconds 0-59
Real Time Clock Day Of Week 040013 PLC Read Real Time Clock Day Of Week 0-6 "Sunday = 0"
**Must Have All Fields Filled To Set PLC Clock, Null Fields Will Write 0's To The Clock**
**Once Desired Clock Values Are Entered, Toggling Bit 0 Of Modbus Register 040001 Or PLC Address V9001.0 Will Set Cloc
Real Time Clock Set Month 040014 PLC Set Real Time Clock Month 1-12
Real Time Clock Set Day 040015 PLC Set Real Time Clock Day 1-31
Real Time Clock Set Year 040016 PLC Set Real Time Clock Year 00-99 "Cannot Enter 2006, Must Enter 06"
Real Time Clock Set Hour 040017 PLC Set Real Time Clock Hour 1-24
Real Time Clock Set Minute 040018 PLC Set Real Time Clock Minute 0-59
Real Time Clock Set Second 040019 PLC Set Real Time Clock Second 0-59
Real Time Clock Set Day Of Week 040020 PLC Set Real Time Clock Day Of Week 0-6 "Sunday = 0"
Description Modbus Registers Usage Notes For Read Only Registers
Battery 1 Volts Reading 040021-040022 Battery 1 Volts Floating Point Value
Battery 2 Volts Reading 040023-040024 Battery 2 Volts Floating Point Value
Battery 1 Amps Reading 040025-040026 Battery 1 Amps Floating Point Value
Battery 2 Amps Reading 040027-040028 Battery 2 Amps Floating Point Value
Engine Run Hours 040029-040030 Engine Run Hours Floationg Point Value
System Pressure PSI 040031-040032 System Pressure 0-300 PSI Floating Point Value
Start Pressure PSI 040033-040034 Screen 101 Start Pressure 0-300 PSI Floating Point Value
Time Until Start 040035 Time Until Start Integer Value (Seconds)
Time Until Stop 040036 Time Until Stop Integer Value (Seconds)
Engine Starts 040037 Number of Engine Starts Integer Value
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