Siemens SIMATIC PCS 7 Manual page 30

Configuration
4-6
In the "Name" column you can see the slot number of the module to be con-
figured. In the actual value column, enter the corresponding MLFB in the
"Module type" row and specify the processing cycle in the "TPM478-proces-
sing cycle" row. See Table 4-3 in >Chapter. 4.7.
Caution
You can configure only one interrupt acquisition module 6DS1601-8AC
or ...-8BA with BGNR061. Although other module types a re not rejected,
they do not function on BGNR061.
This processing cycle configures process image updates on TPM 478. The
following cycles can be set:
TPM478 processing cycle =
Set .Zyklus = 1 for the interrupt generating module "SF61". For additional
periodical monitoring of this module (e.g. for S 305), you must select the
above Zyklus+1 for the module. Then, it makes sense to enter .Zyklus = 33
for interrupt + monitoring cycle 1 sec. If the module is also to be read in the
PLC cycle, ensure that interrupt triggering on this module is enabled at both
edges - positive and negatice (bridge socket X3 with 6DS1601-8BA).
Furthermore, configure the following FM456-4 parameters in SIMATIC-Ma-
nager ³ HW Config:
– Properties FM456-4 → Basic parameters:
Interrupt Selection: Default is "none". Set it to "Process" in order to
enable throughput of the process interrupt from the interrupt triggering
module.
– Properties FM456-4 → Addresses:
The parameters process image (OB PI) and in/output addresses (512)
within this mask must not be changed.
The reaction to the process interrupt has to be programmed by the user in the
OB selected within the addresses mask (e.g. OB40).
The 48 bits read from the group interrupt module by the system, are written
to the FM456-4 process image, and can be read from PIW 512 to PIW 516 by
the user application.
It normally makes sense, and for some modules it is also mandatory (see Ta-
ble 4-3 in Chapter 4.7), to select a process image update cycle time which is
smaller than the time configured for the driver block on PLC processing level
(e. g. approx. by half). To limit load on the TPM 478, however, you should
not use faster cycles than actually required, and you should remove modules
not required anymore. With an improper configuration of TPM 478 (over-
load), take into account that faster cycles are processed with higher priority
than slower ones.
2 10 ms
4 50 ms
8 100 ms
16 500 ms
32 1 s
64 Free cycle (= residual time
Connecting TM I/O to PCS 7
C79000-G8076-C710-04