← SCADA, Industrial Controls & Automation
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Industrial Network Latency Simulator

Modbus TCP · EtherNet/IP · PROFINET · Switch hops + WAN round-trip latency

When to use: Use this to estimate the round-trip communication latency between a controller and a field device across an industrial Ethernet network. Total latency is built from protocol stack processing, per-switch store-and-forward delay, frame serialization, cable propagation, and any WAN link. This determines the fastest practical poll/update rate and whether the link is fast enough for closed-loop control versus supervisory monitoring.

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PLC / Master
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SW1
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SW2
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SW3
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Field Device
Animated request packet traversing 3 switch hops
Network Configuration
Request/response, TCP overhead, polled
Mbps
m
ms
Excellent — fits fast closed-loop control
3.69 ms
Round-Trip Latency
Latency Breakdown
Protocol Stack (per node)1.20 ms
Frame Serialization0.005 ms
Switch Hops (3)0.045 ms
Cable Propagation0.002 ms
WAN / Router0.00 ms
One-Way Latency1.247 ms
Round-Trip (RTT)3.69 ms
Max Practical Update Rate180 Hz
Standards & References
IEC 61784 — Industrial Ethernet profiles
PROFINET RT/IRT, EtherNet/IP CIP, Modbus TCP
Propagation ≈ 2×10⁸ m/s in copper
RTT ≈ 2×(stack + switching + prop) + device