6ES7972-0AA02-0XA0 is a Siemens RS485 repeater used to connect Profibus/SPI bus systems. The relevant introduction is as follows:

1.Functional Features
Signal transmission and regeneration: It can achieve the regeneration of signal amplitude and time, ensuring the stability and
reliability of signals in long-distance transmission or complex network environments. It can effectively extend the transmission
distance of the bus, increase the number of stations (up to 127) and coverage.
Electrical isolation: The electrical isolation function of the connected bus system physically isolates different network
segments. When a fault occurs in one network segment, it can prevent the fault from spreading to other network segments, improving
the stability and anti-interference ability of the system.
Automatic detection of transmission rate: The transmission rate can reach 9.6kbit/s to 12Mbit/s, including 45.45kbit/s, and can
automatically detect and adapt to the transmission rate in the network without manual setting.
• Status indication: By indicating the activity of bus segments 1 and 2, users can easily understand the real-time operation
status of the network; When the terminal resistor is not inserted correctly, segment separation operation can be performed, and
the 24V DC power display is also convenient for users to monitor the power status.
Debugging support: Segment 1 and segment 2 can be separated by a switch, making it easy to perform separate operations and
analysis on different network segments during debugging and troubleshooting.

2.Technical specifications
• Power supply voltage
Rated value (DC): 24V.
• Lower limit of allowable range (DC): 20.4V.
• Maximum allowable range (DC): 28.8V.
• Input current
Maximum current consumption: 100mA (useless appliances on PG/OP sockets); 130mA (there are 5V/90mA electrical appliances on the
PG/OP socket); 200mA (24V/100mA electrical appliances are present on PG/OP sockets).
Typical power loss value: 0.7W.
• Interface
The maximum transmission rate of Profibus DP is 12Mbit/s (9.6kbit/s to 12Mbit/s).
• Protection level and protection category: Protection level IP20.

3.Environmental Requirements
• Operating ambient temperature: minimum 0 ° C, maximum 60 ° C.
Environmental temperature during transportation/storage: minimum value -40 ° C, maximum value 70 ° C.
Maximum relative air humidity (operating): 95% (at 25 ° C).
• Size and weight
• Width: 45mm.
• Height: 128mm.
• Depth: 67mm.
• Weight: Approximately 350g.