Modern warehouses depend on coordinated motion between conveyors, automated storage systems, robots, scanners, sensors, safety devices, and software. CC-Link IE TSN is an industrial Ethernet network designed to connect these devices with predictable timing and high data throughput. This matters because a late control message can cause a missed pick, a stopped conveyor, or an unsafe motion.
In a smart logistics floor, the network is part of the control system, not just a communication cable.
Key Facts
- CC-Link IE TSN combines gigabit industrial Ethernet with time-sensitive networking for deterministic communication.
- Cycle frequency is f = 1/T, where T is the communication cycle time in seconds.
- Propagation delay can be estimated by t = d/v, where d is cable length and v is signal speed in the cable.
- Total message latency can be approximated as L = t_send + t_switch + t_queue + t_receive.
- Bandwidth use is fraction = required data rate / available data rate.
- Time synchronization keeps controllers, drives, robots, and sensors aligned so scheduled messages arrive in assigned time windows.
Vocabulary
- CC-Link IE TSN
- CC-Link IE TSN is an industrial Ethernet network that uses time-sensitive networking to move control and data traffic with predictable timing.
- Deterministic network
- A deterministic network is a communication system where message timing is predictable within specified limits.
- Time-sensitive networking
- Time-sensitive networking is a set of Ethernet standards that schedule traffic, synchronize clocks, and reduce timing uncertainty.
- Latency
- Latency is the time delay between sending a message and receiving or acting on it.
- Jitter
- Jitter is the variation in latency from one message to the next.
Common Mistakes to Avoid
- Treating bandwidth and determinism as the same thing is wrong because a fast network can still deliver messages at unpredictable times.
- Ignoring jitter is wrong because robots and drives may need not only low delay but also consistent delay from cycle to cycle.
- Assuming all warehouse traffic has equal priority is wrong because safety signals, motion control, barcode data, and database updates have different timing requirements.
- Forgetting switch and queue delays is wrong because total latency includes more than cable propagation time.
Practice Questions
- 1 A CC-Link IE TSN control cycle is 250 microseconds. What is the cycle frequency in hertz?
- 2 A warehouse network link carries 120 Mbps of control data, 300 Mbps of vision data, and 80 Mbps of diagnostic data on a 1 Gbps connection. What fraction and percentage of the link bandwidth are being used?
- 3 A conveyor diverter must receive position data at predictable times, while an inventory report can be delayed by a few seconds. Explain which traffic should be scheduled with higher priority on a CC-Link IE TSN network and why.