Siemens SINAMICS V90 Operating Instructions Manual page 196

Control functions
7.7 Communicating with the PLC
Note
The following signals are occupied by Modbus control word when you use the setpoint and
control word from Modbus as the Modbus control source (p29008 = 1). They can only be
enabled by Modbus control word while cannot be enabled by external DI terminals.
• PTI control mode: SON
• IPos control mode: SON, SREF (REF for reference mode 0)
• S control mode: SON, CWE/CCWE
• T control mode: SON
Note
All the reserved bits in register 40100 must be set to 0.
Definition of register 40110
Bit
Signals
0 RDY
1 FAULT
2 INP
3 ZSP
4 SPDR
5 TLR
6 SPLR
7 MBR
8 OLL
9 WARNING 1
10 WARNING 2
11 REFOK
12 MODE 2
13 Reserved
14 Reserved
15 Reserved
Parameter scaling
Due to the limits of the integer data in the Modbus protocol, it is necessary to convert the
drive parameters before transmitting them. This is done by scaling, so that a parameter,
which has a position after decimal point, is multiplied by a factor, to get rid of the fractional
part. The scaling factor is as defined in the above table.
196
PTI, IPos, S and T control modes
Servo ready
Fault status
In-position signal
Zero speed detection
Speed reached
Torque limit reached
Speed limit reached
Motor holding brake
Overload level reached
Warning 1 condition reached
Warning 2 condition reached
Referenced
In the second control mode
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Description
SINAMICS V90, SIMOTICS S-1FL6
Operating Instructions, 07/2015, 6SL3298-0AV60-0BP0