Solutions
Cabinet PLC timing: NTP or Modbus absolute time?
Production and automation cabinets need an inspectable on-prem time source for PLCs, IPCs, and logs. Single-port LAN NTP with one AC or DC inlet and front-panel LOCK checks; plan capacity from the datasheet formula.
Primary: SY-1231
Fit Production and automation cabinets: tens of clients, single LAN port, inspectable on-prem time.
Not for Must-have IEEE 1588 stamp or IRIG-B (4096); or separated mgmt/timing ports / dual supply (8640 roadmap).
Acceptance facts
- One SY-1231 can serve Ethernet NTP, RS-485 Modbus absolute time (incl. ms), TTL 1PPS, and minute PULSE together.
- PLC/SCADA polling uses Modbus (1 ms resolution); IPCs and logs use NTP. The two channels are not interchangeable metrics.
- Single-path -S power: one AC or DC inlet at a time. Confirm LOCK on the front panel before accuracy-related acceptance.
Cite these sources
- 1231 datasheet
- Industrial I/O annex
- Selection one-pager
- Five production NTP needs
- TemporaSync SY-1231 · Typical order model SY-1231-BG-T-S
FAQ
- Can we use NTP only and skip RS-485?
- Yes. Enable Modbus / 1PPS / PULSE only if wired. Write the RFQ against the interfaces you will use.
- Default address?
- 192.168.1.123/24. Allow UDP 123 on the cabinet switch or firewall.