100/180MM DISTRIBUTED GRAPHIC RECORDER: USER GUIDE
Page 127
HA029324
Issue 11 Oct 14
4.3.11 MATHS OPTION (Cont.)
IEEE Area Maths Channel run-time data
The following table gives addresses for the specifi ed 32-bit fl oating-point values, for maths channel 1.
Generally, Parameter address for channel N = Parameter address for channel 1 + 4(N-1) (decimal).
Please see the notes below
CHANNEL 1
Parameter name
Description
Type
Access
Start Addr
Hex (Dec)
Register
Length
Channel 1 value
Current process value (PV)
Float
Read/Write F9EF (63983)
2
Channel 1 status
Channel status
Enum
Read only
F9F1 (63985)
1
0 = Good PV
5 = Ranging error
1 = Channel off
6 = Overfl ow
2 = Over range
7 = Bad PV
3 = Under range
8 = No data
4 = Hardware error
Channel 1 Alarms
Alarm information
Uint16
-
F9F2 (63986)
1
Bit 0: 0 = Alarm 1 inactive; 1 = Alarm 1 active
Read only
Bit 1: 0 = No alarm 1 Ack. required; 1 = Ack. required
Read only
Bit 2: 1 = Acknowledge alarm 1
Read/Write
Bit 3: Spare
Bit 4: 0 = Alarm 2 inactive; 1 = Alarm 2 active
Read only
Bit 5: 0 = No Alarm 2 Ack. required; 1 = Ack. required
Read only
Bit 6: 1 = Acknowledge alarm 2
Read/Write
Bit 7: Spare
Bit 8: 0 = Alarm 3 inactive; 1 = Alarm 3 active
Read only
Bit 9: 0 = No alarm 3 Ack. required; 1 = Ack. required
Read only
Bit 10: 1 = Acknowledge alarm 3
Read/Write
Bit 11: Spare
Bit 12: 0 = Alarm 4 inactive; 1 = Alarm 4 active
Read only
Bit 13: 0 = No Alarm 4 Ack. required; 1 = Ack. required
Read only
Bit 14: 1 = Acknowledge alarm 4
Read/Write
Bit 15: Spare
Notes
1. A/B Switching: ‘B’ values are not accessible via Modbus. For this reason, Span, Zone, Colour
etc. are all ‘A’ values.
2. If an alarm’s Setpoint Source (
section 4.3.3
) is set to anything other than ‘Constant’ the value
returned will be the previously confi gured constant value.
3. Maths channels 101 onwards are not accessible via Modbus.
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