Xxx/74xx register allocation
| Register offset
| Name
| Minimum value
| Maximum value
| Scaling factor
| Units
| Bits/ Sign
|
| 0-1
| Current time since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 2-3
| Time to next maintenance
| -2.14 x109
| 2.14 x109
| 1
| Seconds
| 32S
|
| 4-5
| Time of next maintenance since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 6-7
| Engine run time
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 8-9
| Generator positive KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 10-11
| Generator negative KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 12-13
| Generator KVA hours
| 0
| 4.29 x109
| 0.1
| KVA hour
| 32
|
| 14-15
| Generator KVAr hours
| 0
| 4.29 x109
| 0.1
| KVAr hour
| 32
|
| 16-17
| Number of starts
| 0
| 99999
|
|
| 32
|
| 18-19
| Mains positive KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 20-21
| Mains negative KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 22-23
| Mains KVA hours
| 0
| 4.29 x109
| 0.1
| KVA hour
| 32
|
| 24-25
| Mains KVAr hours
| 0
| 4.29 x109
| 0.1
| KVAr hour
| 32
|
| 26-27
| Bus positive KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 28-29
| Bus negative KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 30-31
| Bus KVA hours
| 0
| 4.29 x109
| 0.1
| KVA hour
| 32
|
| 32-33
| Bus KVAr hours
| 0
| 4.29 x109
| 0.1
| KVAr hour
| 32
|
| 34-35
| Fuel used
| 0
| 4.29 x109
| 1
| Litre
| 32
|
| 36-37
| Maximum positive mains R.O.C.O.F.
| 0
| 10.00
| 0.01
| Hz/s
| 32
|
| 38-39
| Maximum negative mains R.O.C.O.F.
| 0
| 10.00
| 0.01
| Hz/s
| 32
|
| 40-41
| Maximum positive mains vector shift
| 0
| 360.0
| 0.1
| Degrees
| 32
|
| 42-43
| Maximum negative mains vector shift
| 0
| 360.0
| 0.1
| Degrees
| 32
|
| 44-45
| Time to next maintenance alarm 1
| -2.14 x109
| 2.14 x109
| 1
| Seconds
| 32S
|
| 46-47
| Time of next maintenance alarm 1 since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 48-49
| Time to next maintenance alarm 2
| -2.14 x109
| 2.14 x109
| 1
| Seconds
| 32S
|
| 50-51
| Time of next maintenance alarm 2 since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 52-53
| Time to next maintenance alarm 3
| -2.14 x109
| 2.14 x109
| 1
| Seconds
| 32S
|
| 54-55
| Time of next maintenance alarm 3 since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 56-255
| Reserved
|
|
|
|
|
|
Xx register allocation
| Register offset
| Name
| Minimum value
| Maximum value
| Scaling factor
| Units
| Bits/ Sign
|
| 0-1
| Current time since 1/1/70
| 0
| 4.29 x109
| 1
| Seconds
| 32
|
| 2-7
| Unimplemented (Reserved for future use)
|
|
|
|
| 32
|
| 8-9
| S2 positive KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 10-11
| Unimplemented (Reserved for future use)
|
|
|
|
| 32
|
| 12-13
| S2 KVA hours
| 0
| 4.29 x109
| 0.1
| KVA hour
| 32
|
| 14-15
| S2 KVAr hours
| 0
| 4.29 x109
| 0.1
| KVAr hour
| 32
|
| 16-17
| Unimplemented (Reserved for future use)
|
|
|
|
| 23
|
| 18-19
| S1 positive KW hours
| 0
| 4.29 x109
| 0.1
| KW hour
| 32
|
| 20-21
| Unimplemented (Reserved for future use)
|
|
|
|
| 23
|
| 22-23
| S1 KVA hours
| 0
| 4.29 x109
| 0.1
| KVA hour
| 32
|
| 24-25
| S1 KVAr hours
| 0
| 4.29 x109
| 0.1
| KVAr hour
| 32
|
| 26-55
| Unimplemented (Reserved for future use)
|
|
|
|
| 32
|
| 56-255
| Reserved
|
|
|
|
|
|
Page 8 - Alarm Conditions
Notes:
1. These are read only registers.
2. This is the old alarm system, for 72x/73xx and 8xxx/74xx families page 154 should be used instead.
3. Each alarm can be in one of 15 conditions as shown in the table below.
4. Registers 1-32 contain the status of named, internally generated, alarms and indications. These may be extended by future versions of GenComm and any software that reads them must be able to cope with such extensions. This is possible because register 0 specifies the number of pre-defined internal alarm conditions that are implemented on a slave device, the software should read and process the specified number. The software does not need to know the definitions of any new alarms since it can read the alarms strings and display them as specified by the alarm condition. All unimplemented pre-defined alarms return the unimplemented value 15, not an exception.
5. Registers 129-160 contain the status of unnamed digital inputs. Register 128 specifies the number of unnamed digital inputs and any software that reads them must be able to cope with all 128 in the same way as for the pre-defined alarms. All unimplemented digital inputs up to 128 will return the unimplemented value 15, not an exception.
6. Each alarm has 2 strings in pages 32-95 which can be displayed on a PC for example, the alarm code specifies which string it is appropriate to display.
7. The contents of alarm strings will never change while the slave device is operating so a copy can be held by the master to minimise traffic.
Registers
| Register offset
| Name
| Minimum value
| Maximum value
| Bits/ Sign
|
| 0
| Number of named alarms
| 97
| 128
| 16
|
| 1
| Emergency stop
| 0
| 15
| 13/16-16/16
|
|
| Low oil pressure
| 0
| 15
| 9/16-12/16
|
|
| High coolant temperature
| 0
| 15
| 5/16-8/16
|
|
| High oil temperature
| 0
| 15
| 1/16-4/16
|
| 2
| Under speed
| 0
| 15
| 13/16-16/16
|
|
| Over speed
| 0
| 15
| 9/16-12/16
|
|
| Fail to start
| 0
| 15
| 5/16-8/16
|
|
| Fail to come to rest
| 0
| 15
| 1/16-4/16
|
| 3
| Loss of speed sensing
| 0
| 15
| 13/16-16/16
|
|
| Generator low voltage
| 0
| 15
| 9/16-12/16
|
|
| Generator high voltage
| 0
| 15
| 5/16-8/16
|
|
| Generator low frequency
| 0
| 15
| 1/16-4/16
|
| 4
| Generator high frequency
| 0
| 15
| 13/16-16/16
|
|
| Generator high current
| 0
| 15
| 9/16-12/16
|
|
| Generator earth fault
| 0
| 15
| 5/16-8/16
|
|
| Generator reverse power
| 0
| 15
| 1/16-4/16
|
| 5
| Air flap
| 0
| 15
| 13/16-16/16
|
|
| Oil pressure sender fault
| 0
| 15
| 9/16-12/16
|
|
| Coolant temperature sender fault
| 0
| 15
| 5/16-8/16
|
|
| Oil temperature sender fault
| 0
| 15
| 1/16-4/16
|
| 6
| Fuel level sender fault
| 0
| 15
| 13/16-16/16
|
|
| Magnetic pickup fault
| 0
| 15
| 9/16-12/16
|
|
| Loss of AC speed signal
| 0
| 15
| 5/16-8/16
|
|
| Charge alternator failure
| 0
| 15
| 1/16-4/16
|
| 7
| Low battery voltage
| 0
| 15
| 13/16-16/16
|
|
| High battery voltage
| 0
| 15
| 9/16-12/16
|
|
| Low fuel level
| 0
| 15
| 5/16-8/16
|
|
| High fuel level
| 0
| 15
| 1/16-4/16
|
