There are lots of stories out there concerning this subject. The actual answer LIES in the electronic components of the repeater. These DETERMINE the actual “maximum NUMBER. The digitalization from and to the opto-couplers in the repeater will make bits smaller or wider. If you put too many repeaters in series, the bits differentiate too much and messages are not recognized anymore. There are also repeaters available with no limit in serial placement.

Check the manual of the repeater! It should STATE the maximum amount. For example: the Siemens repeater is 9, the Profibus is unlimited.

The second STEP is changing the bus parameters. All repeaters have a delay time. If you put a large quantity of repeaters in series you might have to change the Tslot bus parameter to a higher value.

There are lots of stories out there concerning this subject. The actual answer lies in the electronic components of the repeater. These determine the actual “maximum number. The digitalization from and to the opto-couplers in the repeater will make bits smaller or wider. If you put too many repeaters in series, the bits differentiate too much and messages are not recognized anymore. There are also repeaters available with no limit in serial placement.

Check the manual of the repeater! It should state the maximum amount. For example: the Siemens repeater is 9, the Profibus is unlimited.

The second step is changing the bus parameters. All repeaters have a delay time. If you put a large quantity of repeaters in series you might have to change the Tslot bus parameter to a higher value.