Technical data
8
Technical data
Description Value
Number of sessions
1)
828D 5
840 D sl 10
Number of subscriptions
2)
828D 5
840D sl 10
Maximum samples / second 828D 500 1/s
840D sl 1000 1/s
Min. sampling interval 100 ms
Sampling intervals {100, 250, 500, 1000, 2500, 5000} ms
Min. publishing interval 100 ms
Publishing intervals {100, 250, 500, 1000, 2500, 5000} ms
Max. number of users 20
Max. lifetime interval (LifeTime Count) 3600000 s
Session timeout 60 s
Max. monitored items queue size (Subscription
Queue size)
10000
1) Session = Connection of a client to a server
2) Subscription = In an existing session a subscription is a functionality for monitoring data items.
Calculating maximum subscription load
The maximum number of monitored items (Page 45) depends on the update time of the
subscriptions. Therefore the max. number of monitored items can be calculated as down below.
The maximum subscription load is calculated from the load imposed to the system by the
sample rate of all monitored items from all subscriptions of all active sessions.
Max number of monitored items = Systemload / Updates per second
Updates per second = 1 / Sampling rate (in seconds)
Systemload SINUMERIK 840D sl = 1000 items/s
Systemload SINUMERIK 828D = 500 items/s
SINUMERIK Integrate for Engineering Access MyMachine / OPC UA
Configuration Manual, 04/2018, 6FC5397-1DP41-0BA0 69
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