Procentec ComBricks User Manual

ComBricks User Manual v6.4.0 | January 18| © PROCENTEC 133/219
12.5.3 Spur lines
The trunk line on the PA module can have up to 32 spur lines with the following lengths:
Table 10 - Spur lines
Number of
spur lines
Length of the spur
(Non-Ex)
25 to 32
Max 1 meter
19 to 24
30 meter
15 to 18
60 meter
13 to 14
90 meter
1 to 12
120 meter
The PROFIBUS PA specification allows up to 3 devices on a spur. Please refer to paragraph 12.5.1 for an
explanation on how to connect the PA trunk to the PA module.
12.5.4 Current consumption calculations
The PA module provides a maximum of 500mA to the PA trunk. The total current consumption of all slaves on
this trunk cannot exceed 500mA. The PA module consumes 10mA. At least one FDE (Fault Disconnection
Electronics, stated in the manual of the PA device) should also be calculated . The calculation for the current
consumption is as follows:
See Fig. 88 for an example.
I
SEG
= I
B0
+ I
B1
+ .. + I
BN
+ I
FDE
I
SEG
= Total current in a segment
I
BN
= Basic current of devices
I
FDE
= Current of the Fault Disconnection Electronics

Procentec ComBricks Specifications

General

Brand	Procentec
Model	ComBricks
Category	Switch
Language	English