Data Sheet for Product

14
Siemens
A6V12005486_en--_c
Smart Infrastructure
2021-05-17
Diagrams
Connection terminals
RDF660MB/MM
RDF660MB
L, N
Operating voltage AC 230 V
Y50
DC 0...10 V fan output
M
Reference for DC fan
Y1, Y2
Control output “Valve” AC 230 V (N.O., for normally closed valves), output
for compressor or output for electric heater
B1, S1
(RDF660MB/MM
only)
Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-
free switch
Factory setting:
B1 = H/C changeover (DI)
S1 = Window contact
X1, X2
(RDF660MB only)
Multifunctional input for temperature sensor (e.g. QAH11.1) or potential-
free switch
Factory setting:
X1 = Window contact
X2 = External temperature sensor
M
Measuring neutral for sensor and switch
REF
RS485 signal / common ground (differential common)
A +
RS485 Modbus connection
B –
RS485 Modbus connection