Connection
4.1 Setting the PROFIBUS address
ASM 456 interface module
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Operating Instructions, 07/2015, J31069-D0162-U001-A6-7618
NOTICE
Number of operable readers/reading points
Note that you can normally connect two readers to the ASM 456 and operate them. The
readers RF680R and RF685R are an exception. On the ASM 456, only one
RF680R/RF685R reader can ever be operated at connector socket X1 and one reading
point. This ensures that the maximum permitted total current of 750 mA is not exceeded.
Digital I/Os must always be operated with an external power supply.
NOTICE
Voltage drop with extension cables
Note that using extension cables (connection between communications module ↔ Reader,
M12 connector eight-pin socket, 160 mohm/m) depending on the current consumption may
lead to a voltage drop on the reader. This voltage drop can mean that the required
minimum voltage on the reader is below the required 20 V.
Cable lengths > 20 m (6GT2891-4FN50) are not permitted for the RF680R/RF685R
readers.
4.1
Setting the PROFIBUS address
Properties
With the PROFIBUS address, you specify the address at which the ASM 456 distributed I/O
system is addressed on PROFIBUS DP.
Requirements
●
The PROFIBUS DP address for the ASM 456 is set on the connection block.
●
Each address can be assigned only once on PROFIBUS DP.
●
The PROFIBUS address set must match the PROFIBUS address specified in the
configuration software (for the ASM 456).
●
A change to the PROFIBUS DP address is only valid after the power has been switched
ON on the ASM 456.
