GE PACSystems RX3i

Chapter 6. Redundant Media
132 PACSystems* RX3i & RSTi-EP PROFINET IO-Controller User Manual GFK-2571N
6.1.6 Minimum I/O Update Rates for Bumpless Operation in an MRP
Ring Topology
If your application requires the PROFINET IO to operate in a bumpless fashion (i.e., experience no
Loss of Device faults and no defaulting of IO) whenever a break in the ring occurs, then the IO Update
Rates of all the devices in that ring must be no smaller than the Minimum IO Update Rate described
in this table.
When no third-party items participate in the ring:
Ring Port Usage
I/O-Devices in the Ring
Minimum I/O Update
Rate (ms)
Additional Media Redundancy
Manager Requirements
PNC001 Ports 1 & 2 both
operating at 100 Mbps
VersaMax PNS and/or RX3i
CEP
1
None
An RX3i PNS (or RX3i GCG)
using Port 1 & Port 2 for ring
2
None
An RX3i PNS using Port 3 or
Port 4 for the ring
16
Set Default Test Interval to
10ms. Set Test Monitoring
Count to 2.
An RSTi-EP PNS
32
CPE330/CPE400 Embedded
PROFINET (LAN2): Both
Ports operating at
100 Mbps
VersaMax PNS and/or RX3i
CEP
8
None
An RX3i PNS (or RX3i GCG)
using Port 1 & Port 2 for ring
8
None
PNC001 Port 1 or Port 2
operating at 1000 Mbps
An RX3i PNS, VersaMax PNS
and/or RX3i CEP, or RX3i
GCG
16
Set Default Test Interval to
10ms. Set Test Monitoring
Count to 2.
PNC001 Port 3 or Port 4
operating at any speed
CPE330/CPE400 Embedded
PROFINET (LAN2): Either
Port operating at
1000 Mbps
An RSTi-EP PNS
32
CPE100/CPE115 Embedded
PROFINET (LAN2):
Port 2 & Port 3 operating at
100Mbps
An RX3i PNS, VersaMax PNS
and/or RX3i CEP, or RX3i
GCG
16
None
An RSTi-EP PNS
32
If any third-party items participate in the ring, the minimum I/O Update Rate is the larger of the following two options,
regardless of which ports are used for the ring:
• The smallest I/O Update Rate selectable within PME that is more than 1/2 of the largest worst-case ring recovery
time among the third-party items. For example, if the manufacturer states that the worst-case ring recovery time is
96ms, the rate needs to be more than 96ms divided by 2, which is 48ms. The next available rate above 48ms is
64ms.
• 16ms I/O Update Rate. When using an I/O Update Rate of 16ms, set the Default Test Interval to 10ms and the Test
Monitoring Count to 2 on the Media Redundancy Manager.