CC-PCNT02 Honeywell

Maximum Number of PCDI Request block messages per second 

– includes both Reads and Write 6

(maximum size 256 byte messages assumed)

250 30

Process Data Access (PDA) Capacity and Performance 50 ms CEE 20 ms CEE

Maximum number of PGM PDA connections per C300 4 Not Supported

Maximum number of Decentralized Periphery (DP) networks per 

C300

8 Not Supported

Maximum number of PIOMB blocks per C300 Controller 12 640 Decentralized 

Periphery (DP) 

devices

Not Supported

Maximum number of Process Data Collection (PDC) messages 

per second

– includes both Reads and Write (maximum size 256 byte 

messages assumed)

2500 PDC messages 

per second

Note 2 – Exchange Peer-Peer does not count against this limit.

Note 3 – There are 31 connections reserved for Peer-Peer in the C300. 1 connection is reserved for Internal C300 useonly, leaving 30 connections available for User P2P configurations. 

Note 4 – 1 DHRIO Module only counts as 1 Target Device even when communicating with multiple PLCs on either of 

the two DH+ networks per DHRIO.

Note 5 – Redundant devices that use two PCDI Master blocks count as only one device. Secondary test messages do 

count in the messages per second for C300 performance estimation.

Note 6 – PCDI impact on C300 performance can be estimated with the C300 Performance Model worksheet (see 

section 2.3.4); important factors are number of PCDI Master blocks, number of PCDI Request block messages 

per second, and message data size. 

Note 7 – Incoming peer data benefits from the RBE (Report by Exception) comparisons done at the data source, so 

only changed parameters contribute to the incoming PPS load.

Note 8 – Outgoing peer data capacity is defined/measured before the RBE (Report by Exception) comparisons are 

done, so all parameters requested as peer data contribute to the outgoing PPS load, whether they are 

changing or not and sent over the network or not.

Note 9 – CDA Peer connection to a redundant SM consumes 2 PCUs.

Note 10 – PCDI Licenses per Server is limited to 256 total PCDI Device Blocks for all C300s and ACEs combined.

Note 11 - Float, integer, or BOOLEAN values configured constitute one parameter

Note 12- Number of PIOMB blocks that can be instantiated or loaded to the C300 is limited by the C300 CEE memory, 

and CPU.

Note 13- Overlap between controller CDA peer and display responder requests was removed for C300v2 and C300E in 

R510 release to prevent loss of peer communication during high display subscriptions from process 

operational display