Frequently Asked Questions (FAQ)

Q1: How many controllers can a single Mark VIe network support?
A1: Up to 40 IS220UCSA‑class controllers can share the same I/O network, each hosting its own application.

Q2: Does the IS220UCSAH1A support IEC 61131‑3 languages?
A2: Yes. Control Builder provides ladder, function block, structured text, and state‑machine editors.

Q3: Can the controller log data locally?
A3: It includes 4 GB industrial flash for event logs, SOE (1 ms), and historical data buffering when the historian link is down.

Q4: What redundancy options are available?
A4: Duplex (A/B) redundancy with bumpless transfer; controllers synchronize over dedicated link.

Q5: How is firmware updated securely?
A5: Signed firmware images are loaded via encrypted session; TPM verifies signatures before execution.

Q6: Which fieldbus protocols are natively supported?
A6: Modbus TCP/RTU, OPC UA (server), and GE SRTP; Profibus or HART via companion I/O packs.

Q7: Is there a built‑in touchscreen or display?
A7: No local HMI—the unit is headless. All configuration and diagnostics are performed through ToolboxST or ControlST.

Q8: What happens if power is lost?
A8: Battery‑less non‑volatile RAM stores last state; on power return the controller resumes application automatically.

Q9: Does the module require forced air cooling?
A9: Passive convection is sufficient; ensure 25 mm clearance above/below for airflow.

Q10: Can I develop custom cybersecurity policies?
A10: Yes. Role‑based access, password complexity, and network firewall rules are configured in the Security ST toolset.