Number ofhops innetworkInternalapplicationdelay (μs)(50Hz)Internalswitchdelay (μs)Store andforwardlatency (μs)Queuelatency(μs)1)Additionaltolerance(μs)2)Theoreticalmax delay(μs)Recommended maxdelaysetting (μs)20 1746 200 240 2400 350 4936 440025 1746 250 300 3000 400 5696 565030 1746 300 360 3600 450 6456 56501) Queue latency calculated when the port has started to send a full-sized frame (1500 bytes) before theSMV frame and the switch has been configured to prioritize SMV2) Additional tolerance in case of long wires or disturbance in networkTable 10:Protection delays and network marginsSMV Max Delay setting 50 Hz(ms)Ethernet network margin 50 Hz(ms)1)Protection delay 50 Hz (ms)1.90 0.25 1.253.15 1.5 2.54.40 2.75 3.755.65 3 56.90 4.25 6.251) Average values, variation is ±0.1 ms6.4.5 IEEE 1588 v2 parameters and status informationTimeThe time parameters are found via menu path Configuration/Time..Table 11:Time parametersParameter Value RangeSynch source IEEE 1588PTP Domain ID 0 0...255PTP priority 11) 128 0...255PTP priority 21) 128 0...2551) Smaller value has higher priorityIn IEEE 1588 v2, the PTP domain is a logical grouping of clocks that synchronize toeach other using the protocol but that are not necessarily synchronized to clocks inanother domain.PTP priority 1 and PTP priority 2 are used in the execution of the best master clockalgorithm in which lower values take precedence. Priority 1 is the first one used todecide the clock master.Section 6 1MRS757809 CProcess bus and IEEE 1588 time synchronization74 REC615 and RER615Engineering Guide
