Physical Layer; Connecting A Pa Segment - Procentec ComBricks User Manual

Table 8 - Bus Parameters for PA projects, in bit times
Baud rate
9.6 – 19.2 kbps
45.45 kbps
93.75 kbps
187.5 kbps
500 kbps
1.5 Mbps
These are 'worst case' values. It is recommended to examine the timing of your installation and decrease the
bus parameters to a suitable value for your network.
The DP-V1 table has higher slot times than the Data Exchange table because DP-V1 telegrams can be up to 240
bytes. Such a telegram takes a long time to be generated, and therefore the Tslot needs to be larger.
In small applications it is required to set a value for the Tset parameter. Usually a value of 95 is sufficient.
Because of the longer Slot Time and MaxTSDR, it is also recommended to set the Watchdog to at least 2
seconds. This is normal in PA networks.
In Coupler mode, the module has no bus address on either side. When configuring your PA network there is no
restriction in the use of addresses for field devices, although most configuration tools do not allow address 0, 1
and 2.

12.5 Physical layer

12.5.1 Connecting a PA segment

The bottom of the PA module has two identical connections for the PA trunk. These are connected 1-on-1. As
stated above the integrated termination is ON when power is connected to the PA module, which means that
the PA module is always the start of a segment. The automatic termination cannot be disabled. Most
installations will use only one connector. In that case it does not matter which connector is chosen. See Fig. 86
for an example.
It is also possible to use the second connector as a stub line, as shown in Fig. 87. Do not terminate the end of a
stub line, otherwise the PA segment has too many terminations.
ComBricks User Manual v6.4.0 | January 18| © PROCENTEC
Tslot MaxTSDR
(only DX) (only DX)
330 145
640 480
2500 1000
3200 1500
8500 4000
25500 11500
Tslot MaxTSDR
(with DP-V1) (with DP-V1)
1500 150
640 480
2500 1000
14000 1400
38000 3700
110000 11000
130/219