Grundfos MAGNA3/MGE/MPC pumps (needs CIM 200 Modbus module)

Register map(s) for this device, with a note of how far each has been checked. Addresses are 0-based, as on the wire. Scale and byte order are confirmed only at the hardware-verified rung.

coherence-checked

Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.

point	address (0-based)	type	scale	unit
SlaveMinimumReplyDelay	0	U16	1	ms
SoftwareDefinedModbusAddress	2	U16	1
SoftwareDefinedBitRate	3	U16	1
AutoAckControlBits	4	U16	1
SoftwareDefinedParity	8	U16	1
SoftwareDefinedStopBit	9	U16	1
Watchdog	11	U16	1	s
GENIbusDiodeOff	12	U16	1
GENIbusCRCErrorCnt	20	U16	1
GENIbusDataErrorCnt	21	U16	1
VersionNumber	22	U16	1
ActualModbusAddress	23	U16	1
GENIbusTXcountHI	24	U16	1
GENIbusTXcountLO	25	U16	1
GENIbusRXcountHI	26	U16	1
GENIbusRXcountLO	27	U16	1
UnitFamily	29	U16	1
UnitType	30	U16	1
UnitVersion	31	U16	1
ProductSoftwareVersionHI	33	U16	1
ProductSoftwareVersionLO	34	U16	1
ProductSoftwareDayMonth	35	U16	1
ProductSoftwareYear	36	U16	1
Pump control bits	100	U16	1
ControlMode	101	U16	1
OperationMode	102	U16	1
Setpoint	103	U16	0.01	%
RelayControl	104	U16	1
SetMaxFlowLimit	105	U16	0.01	m3/h
SetPumpUnixRtcHI	106	U16	1
SetPumpUnixRtcLO	107	U16	1
SensorFeedback	108	U16	0.01	%
SetKp	109	U16	0.1
SetTi	110	U16	0.1	s
SetDirectCtr	111	U16	1
Pump status bits	200	U16	1
ProcessFeedback	201	U16	0.01	%
ControlMode	202	U16	1
OperationMode	203	U16	1
AlarmCode	204	U16	1
WarningCode	205	U16	1
BearingService	206	U16	1
DriveState	207	U16	1
FeedbackSensorUnit	208	U16	1
FeedbackSensorMin	209	U16	1
FeedbackSensorMax	210	U16	1
NomFrequency	211	U16	0.1	Hz
MinFrequency	212	U16	0.01	%
MaxFrequency	213	U16	0.01	%
SetpointRangeMin	214	U16	0.01	%
SetpointRangeMax	215	U16	0.01	%
FlowEstimationState	220	U16	1
Kp	221	U16	0.1
Ti	222	U16	0.1	s
DirectControl	223	U16	1
ControlSource	224	U16	1
Head	300	U16	0.001	bar
VolumeFlow	301	U16	0.1	m3/h
RelativePerformance	302	U16	0.01	%
Speed	303	U16	1	rpm
Frequency	304	U16	0.1	Hz
DigitalInput	305	U16	1
DigitalOutput	306	U16	1
ActualSetpoint	307	U16	0.01	%
MotorCurrent	308	U16	0.1	A
DCLinkVoltage	309	U16	0.1	V
MotorVoltage	310	U16	0.1	V
Power	311	U32BE	1	W
RemoteFlow	313	U16	0.1	m3/h
InletPressure	314	U16	0.001	bar
RemotePressure1	315	U16	0.001	bar
FeedTankLevel	316	U16	0.01	m
PowerElectronicTemp	317	U16	0.01	K
MotorTemp	318	U16	0.01	K
RemoteTemp1	319	U16	0.01	K
ElectronicTemp	320	U16	0.01	K
PumpLiquidTemp	321	U16	0.01	K
BearingTempDE	322	U16	0.01	K
BearingTempNDE	323	U16	0.01	K
AuxSensorInput	324	U16	0.01	%
SpecificEnergyConsumption	325	U16	1	Wh/m3
OperationTime	326	U32BE	1	hour
TotalPoweredTime	328	U32BE	1	hour
Torque	330	U16	0.1	Nm
Energy	331	U32BE	1	kWh
NumberOfStarts	333	U32BE	1	start
RemoteTemp2	336	U16	0.01	K
UserSetpoint	337	U16	0.01	%
Diffpressure	338	U16	0.001	bar
OutletPressure	339	U16	0.001	bar
RemotePressure2	340	U16	0.001	bar
LoadPercent	341	U16	0.01	%
PumpUnixRtc	342	U32BE	1	second
MaxFlowLimit	344	U16	0.1	m3/h
RemoteDiffTemp	345	U16	0.01	K
InletDiffPressure	346	U16	0.001	bar
OutletDiffPressure	347	U16	0.001	bar
RemoteDiffPressure	348	U16	0.001	bar
StorageTankLevel	349	U16	0.01	m
AmbientTemp	350	U16	0.01	K
HeatEnergyCounter1	351	U32BE	1	kWh
HeatPower	353	U32BE	1	W
HeatDiffTemp	355	U16	0.01	K
Volume1	356	U32BE	0.01	m3
HeatEnergyCounter2	358	U32BE	1	kWh
Volume2	360	U32BE	0.01	m3
Conductivity	362	U16	0.1	NTU
PHMeasure	363	U16	0.01	PH
Turbidity	364	U16	1	uS/cm
Simulation. AlarmCode	700	U16	1
Simulation. WarningCode	701	U16	1
Simulation. Activate	707	U16	1
Simulation. Active	708	U16	1
UserRegisters	750	U16	1

link settings as documented (unverified): RTU/TCP; default 19200 8E1; unit ID 231; FC 03,04,06,08,16; Default transmission speed is 19200 bits per second. Default parity is Even parity (1 stop bit). Default Modbus address is 231 (0xE7).

bench facts as documented (unverified)

terminals	Conductors: D0, D1 and Common for CIM 200; A, Y, B for SoftCIM
A/B polarity	D1 is positive, D0 is negative
termination	DIP switches SW1 and SW2 on CIM 200
connector	Screw-type terminal
shield/ground	Connect the cable screen to protective earth at both ends
max registers/read	125
broadcast	supported
protocol notes	Telegrams must be separated by a silent interval of at least 3.5 times the character time.
model register	29
firmware register	33
power	24-240 V
environment	Operating temperature -20 to +45 °C, Ambient humidity 30 % to 95 % Relative, non-condensing
doc revision	05.2025

field reports — community-sourced, unverified (checked 2026-06-11)

Siemens S7-1200 MB_CLIENT write operations fail to update pump parameters if the zero-based address offset is not correctly configured (e.g., register 40100 must be addressed as 99 in MB_CLIENT). [source]
Users report that writing to holding registers requires using 'write multiple holding registers' (Function Code 16) rather than 'write single register' (Function Code 06) to avoid values not updating or getting strange results. [source]
confirmed: Baud rates [1200, 2400, 4800, 9600, 19200, 38400] with default 19200 — confirmed by Grundfos Modbus manual
confirmed: Default unit ID 231 — confirmed by Grundfos Modbus manual
confirmed: Framing RTU and TCP — confirmed by Grundfos Modbus manual covering both CIM 200 (RTU) and CIM 500 (TCP)
confirmed: Function codes 3, 4, 6, 8, 16 — confirmed by Grundfos Modbus manual
confirmed: Parity Even, 1 stop bit — confirmed by Grundfos Modbus manual
confirmed: Identification registers (firmware at 33, model at 29, 0-based) — confirmed by Grundfos Modbus manual (1-based 34 and 30)
confirmed: Physical connector (Screw-type terminal), polarity (D1 positive, D0 negative), shield ground, terminals, and termination — confirmed by Grundfos Modbus manual
confirmed: Power 24-240 V — confirmed by Grundfos Modbus manual for CIU unit

The trust ladder

Each rung states what it proved and what it did not. Gray until proven; green is earned by hardware only.

generated — A prompt produced it. Unproven — anyone can regenerate this.
structure-verified — Decode path is structurally sound (addresses, widths, finite values). Does NOT prove word order or scaling.
coherence-checked — Round-trips through a real Modbus stack with no overlapping addresses and a word-order-sensitive codec — the map is internally coherent and wire-decodable. Does NOT prove byte-order or scaling match a real device: the emulator is seeded from the map's own types, so a uniformly wrong byte-order still round-trips. Only hardware-verified confirms byte-order/scale on the wire.
hardware-verified (software-key) x1 — Matched a real device with operator-attested readings as ground truth — the only rung that confirms word order + scaling on the wire.

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