BECKHOFF BC3100 - Manual (Page 33)

PROFIBUS bus terminal controller BC3100
BC3100 33
process data:
Identifier Description
A: Only the value is sent (no register communication possible)
B: The complete channel is sent (register communication possible)
C: The value plus control plus status is sent (no register
communication possible)
D: The value plus status is sent (no register communication
possible)
E: The value plus control is sent (no register communication
possible)
There are also 2 different identifiers per terminal for mapping them into the
process data.
Identifier Description
F: Only the values are sent (up to 16 words) (no register
communication possible)
G: All complete channels are sent (up to 16 words) (register
communication possible)
Therefore, for each analog channel, the master can decide how much data
the respective channel is to occupy in the process image.
As there are also DP masters that write back configuration read out in the
slave (e.g. CP5431 from Siemens), bit 2 from register 3 in Table 0 of the
bus terminal controller can be set to define whether the Cfg_Data of the
Get_Cfg service is to be mapped according to A (bit 2 = 0) or B (bit 2 = 1)
(see parametrisation). You have access to this table by way of the KS2000
configuration software.