Emerson SI-PROFIBUS

40 Unidrive M SI-PROFIBUS User Guide
Issue Number: 3
If input consistency action (Pr S.01.026) is set to On (1), the SI-PROFIBUS module will
check the value of the parameter specified by the input consistency trigger parameter
(Pr S.01.027). If the input consistency trigger parameter defined by Pr S.01.027 is set to
a non-zero value (for example by a user program in an applications module), this
indicates to the SI-PROFIBUS module that all the mapped parameters are ready to be
read. The module will then read the mapped parameters, transfer them to the PLC and
will then clear the input consistency trigger parameter to zero. When the input trigger
source parameter is set to zero, the SI-PROFIBUS module will continue to transfer the
input consistency trigger parameter previously read data to the PLC.
If output consistency action (Pr S.01.028) is set to On (1), the SI-PROFIBUS module will
check the value of the parameter specified by the output consistency trigger parameter
(Pr S.01.029). The output consistency trigger parameter defined by Pr S.01.029 will
initially be set to 1.
If the output consistency trigger parameter is set to zero (for example by a user program
in an applications module), this indicates to the SI-PROFIBUS module that all the
mapped parameters are ready to be written to. The module will then write the data from
the master controller into the mapped parameters, and will then set the output trigger
source parameter to 1. When the output consistency trigger parameter is set to 1, it
indicates to the SI-PROFIBUS module that the mapped parameters are not ready to be
written to, and therefore any new data from the master controller will not be written to
the mapped parameters in the drive until the output consistency trigger parameter is
again set to zero.
Sending non-cyclic data over the cyclic channel can only be accomplished when the
SI-PROFIBUS module is set up for a Unidrive SP in compatibility mode
(Pr S.01.031 = “UniSP” or “UniSP extended”) and the correct GSD file used for the
simulated drive (e.g. SP_0672.GSD).
The term 'non-cyclic over cyclic' is used to refer to non-cyclic data which is transmitted
as part of the cyclic data and not using the non-cyclic DP-V1 channel.
The table below shows how to configure the non-cyclic over cyclic parameter
(Pr S.01.030) for the required non-cyclic mode.
Table 6.9 Non-cyclic over cyclic modes
For more information on sending / receiving non-cyclic data see section 9 Non-cyclic
data on page 52.
Non-cyclic over cyclic
S.01.030
Default None (0)
Range None (0) to PPO defined (2)
Access RW
Value Text Description
0
1 CTNC 1 Non-cyclic word (CT Single Word mode 1)
2 PPO defined 4 Non-cyclic words (PPO 4 Word mode 2)