Emerson PACSystems RX3i, User Manual

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RSTI-EP PROFINET I/O Controller User Manual Section 3
GFK-2571R May 2021
Configuration 49
3.1.1 System Planning
Device Ownership
Note that all modules in an IO Device must belong to the same PROFINET network, that is,
they are all owned by the same PROFINET Controller. I/O modules within an IO-Device
cannot be split between PROFINET Controllers.
PROFINET Controller Loading Limits
To prevent overloading of the PROFINET Controller, the maximum number of IO Devices
that can be configured is limited, per the table below. Note that the loading threshold is
different for embedded PROFINET Controllers (in the CPL410, CPE400, CPE330 and
CPE100/CPE115) than in the rack-mounted IC695PNC001. The PROFINET Controller
loading limits are enforced by PAC Machine Edition.
Devices configured with a longer update periods present smaller data loads to the PROFINET
Controller. For example, a device with an update rate of 2ms presents a load equivalent to
that of two devices at 4ms.
Maximum Configuration at Each Update Rate
The maximum number of devices allowed is determined by their update rates as shown in
the following calculations:
PNC001
𝑆𝑈𝑀 (
𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝐷𝑒𝑣𝑖𝑐𝑒𝑠 𝑎𝑡 𝑈𝑝𝑑𝑎𝑡𝑒 𝑅𝑎𝑡𝑒 𝑥
𝑈𝑝𝑑𝑎𝑡𝑒 𝑅𝑎𝑡𝑒 𝑥
) ≤ 8 𝑑𝑒𝑣𝑖𝑐𝑒𝑠/𝑚𝑠
CPE400, CPL410, & CPE330
𝑆𝑈𝑀 (
𝑁𝑢𝑚𝑏𝑒𝑟 𝑜𝑓 𝐷𝑒𝑣𝑖𝑐𝑒𝑠 𝑎𝑡 𝑈𝑝𝑑𝑎𝑡𝑒 𝑅𝑎𝑡𝑒 𝑥
𝑈𝑝𝑑𝑎𝑡𝑒 𝑅𝑎𝑡𝑒 𝑥
) ≤ 2 𝑑𝑒𝑣𝑖𝑐𝑒𝑠/𝑚𝑠
Update
Rate (x)
per Device
(ms) Total Number
of Devices per
PNC001 Total Number of Devices per Embedded PROFINET
IO Controller
CPE400 &
CPE330
CPL410 CPE100/CPE115
1 8 2 2 0
2 16 4 4 0
4 32 8 8 0
8 64 16 16 0
16 – 512 128 (total device
limit) 32 64 8
In the case of PNC001, if the configuration exceeds the equivalent of eight devices with 1ms
update rates, Machine Edition will not store the configuration.
For the embedded PROFINET Controllers in CPL410, CPE400, and CPE330, if the
configuration exceeds the equivalent of two devices with 1ms update rates, Machine Edition
will not store the configuration.