APPLICATION DATA
PSS-00003A
Specification for ModBus Communication
Jan 2003
Supersedes: N/A
Applicability:
Turbocor TT300 compressor
References:
ModBus Application Specification V1.1 by ModBus.org.
Introduction:
This application data sheet defines the registers and functions implemented to monitor/control a
Turbocor TT300 compressor.
Implemented Functions:
03 (0x03) Read Holding Registers
This function code is used to read the contents of a contiguous block of holding registers in a
remote device.
The register data in the response message are packed as two bytes per register, with the binary
contents right justified within each byte. For each register, the first byte contains the high order
bits and the second contains the low order bits.
06 (0x06) Write Single Register
This function code is used to write a single holding register in a remote device.
The Request PDU specifies the address of the register to be written.
Turbocor Inc.
PSS-00003A REV. 1
1 OF 5
TT-300 Register Definition
Register
Address
TT-300
Device
TT-300 Parameter
Access
Translation Rule
40020
SoftStart
0: Status
R
Bit 0: NOK->0 / OK->1
1: SCRs
R
Bit 1: OFF->0 / ON->1
40021
3: Line 1-2
R
1:1
40022
4: Line 2-3
R
1:1
40023
5: Line 3-1
R
1:1
40024
6: DC Bus
R
1:1
40025
8: UpTrip
R
1:1
40026
9: Dn Trip
R
1:1
40027
14: Version
R
Digits without dots.
40028
15: VoltDrop
R
1:1
40029
16: RxxVolts
R
1:1
0: Alarms
R/W
Writing a value different than 0 to
this register will clear all error
messages.
Bit 0
I 0/1: Inverter Temperature
Bit 1
A 0/1: Motor Current
Bit 2
B 0/1: Bearing Current
Bit 3
C 0/1: Shaft Cavity Temperature
Bit 4
D 0/1: Discharge Pressure
Bit 5
L 0/1: Leaving Chilled Water
Temp
Bit 6
P 0/1: Power Input
Bit 7
S 0/1:Suction Pressure
Bit 8
T 0/1: Discharge Pressure
Bit 9
W 0/1: Winding Temperature
Bit 10
X 0/1: External Interlock
Bit 11
Y 0/1: Waiting for SoftStart
Bit 12
Z 0/1: Motor Bearing Controller
Bit 13
+ 0/1: Watchdog Timer
Bit 14
- 0/1: Compressor Rotating
Bit 15
Fail->1 / OK->0
40030
Control
21: Interlok
Turbocor Inc.
PSS-00003A REV. 1
2 OF 5
Register
Address
TT-300
Device
TT-300 Parameter
Access
Translation Rule
40031
1: Demand
R/W
1:10
40032
1: Demand mode
R/W
M: 1
A: 2
N: 3
C: 4
40033
2: IGV
R
1:10
40034
3: Suction
R
1:10 Signed Value
40035
4: Interm P
R
1:10
40036
5: Dischg P
R
1:10
40037
6: Suction T
R
1:10 Signed Value
40038
7: Interm T
R
1:10
40039
8: Dischg T
R
1:10
40040
9: Cavity T
R
1:10
40041
10: Enter T
R
1:10
40042
11: Leave T
R
1:10
40043
19: Surge
R
1:1
40044
20: Choke
R
1:1
40045
22: Version
R
Digits without dots.
40046
23: Serial
R
1:1
40047
24: Units
R/W
0 -> Imperial / 1 -> Metric
40048
25: Suct SP
R
1:1 Signed Value
40049
26: SPAlmDel
R
1:1
0: MLL/SH State
R
1:10
0/8: MLL/SH
R/W
40050
EX Valve
40051
ALL/SH Mode
Main
Auxiliary
Turbocor Inc.
PSS-00003A REV. 1
Bits 0-3
%L -> 1
Bits 0-3
KS -> 2
Bits 0-3
FS -> 2
Bits 0-3
KM -> 3
Bits 0-3
FM -> 3
Bits 4-7
%L -> 1
Bits 4-7
KS -> 2
3 OF 5
Register
Address
TT-300
Device
TT-300 Parameter
Access
Translation Rule
Bits 4-7
FK -> 2
Bits 4-7
KM -> 3
Bits 4-7
FM -> 3
Writing 0 mode leaves the register unchanged. This allows the change of a
single valve mode. E.g. if the value 0x11 is written both valves are set to
mode A. If 0x10 is written, only he auxiliary mode is altered, leaving the
main mode at its current value.
40052
1: MEXValve
R
1:10
40053
2: MEXStart
R
1:1
40054
3: MEXDelay
R
1:1
40055
4: MEXSt Pt
R
1:1
40056
5: MEX Int
R
1:1
40057
6: MEX Prop
R
1:1
40058
7: MEX Der
R
1:1
40059
8: ALL/SH State
R
1:10
40060
9: AEXValve
R
1:10
40061
10: AEXStart
R
1:1
40062
11: AEXDelay
R
1:1
40063
12: AEXSt Pt
R
1:1
40064
13: AEX Int
R
1:1
40065
14: AEX Prop
R
1:1
40066
15: AEX Der
R
1:1
40067
16: Cooling
R
Full->2 / Half->1 / Off->0
0: Floating
R
OFF->0 / ON->1
40069
4: Ax Force
R
1:100
40070
5: FX Force
R
1:100
40071
6: FY Force
R
1:100
40072
7: RX Force
R
1:100
40073
8: RY Force
R
1:100
40074
11: Version
R
Digits without dots.
40075
12: Fault #
R
Hexnumber
40076
13: Alarm #
R
Hexnumber
0: Act RPM
R
1:1
40068
40077
Bearing
Motor
Turbocor Inc.
PSS-00003A REV. 1
4 OF 5
Register
Address
TT-300
Device
TT-300 Parameter
Access
Translation Rule
40078
1: Des RPM
R
1:1
40079
2: MotorAmp
R
1:10
40080
3: Pwr (kW)
R
1:10
40081
4: Inv Temp
R
1:10 always displayed in °C.
40082
8: Fault #
R
Hexnumber
40083
9: Alarm #
R
Hexnumber
Turbocor Inc.
PSS-00003A REV. 1
5 OF 5