Multiplexer (Mux) Data Registers - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

Multiplexer (MUX) Data Registers

Description
Multiplexer (MUX) data registers are used when a PLC needs to read more registers than the
number of built in 'Data from Drive' registers, which is 64.
The drive has 8 MUX registers. Each MUX register uses:
● 1 'Data to Drive' register
● 2 'Data from Drive' registers.
The MUX data can access any manual ID register from the drive. Using MUX data registers
requires "handshaking" to take place between the PLC and the drive. MUX data allows the
PLC to access more than 64 registers worth of data but at a slower rate.
Setup Procedure
1. Set one of the 62 programmable 'Data from Drive' registers to "Mux1 Data".
2. Set one of the 62 programmable 'Data from Drive' registers to "Mux1 Echo".
3. Set one of the 62 programmable 'Data to Drive' registers to "Mux1 Id".
4. Repeat the steps above to use additional MUX registers (Mux2 to Mux8).
Operation
The handshaking operates in the following way:
● The PLC writes a manual ID number into the "Mux1 Id" register.
● The PLC polls the "Mux1 Echo" register until the manual ID set in the "Mux1 Id" register is
present in the "Mux1 Echo" register.
● The PLC reads the data from the "Mux1 Data" register. The data is the value for the manual
ID.
NXGpro Communication
Function Manual, AB, A5E33486415A
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