Becsys5 Installation And Technical Manual -

A phase is the smallest executable action.

Example Structured Text for a fill phase:

(* Wait for start command *)
WAIT_FOR StartCmd = TRUE;
(* Open fill valve *)
FillValve := ON;
(* Monitor flow meter until setpoint *)
WHILE (FlowTotal < TargetVolume) DO
    SLEEP(100);  (* ms *)
END_WHILE;
(* Close valve and signal complete *)
FillValve := OFF;
PhaseComplete := TRUE;

Problem: MCM does not boot (no PWR LED)

Problem: SYS LED flashing red (I/O module fault) becsys5 installation and technical manual

Problem: BACnet devices not discovered

Problem: Analog input reads saturated (0 or 4095)

Problem: Cannot access Web UI

Before you commission the system, use this sign-off list derived from the official BECSys5 installation and technical manual.

  • HMI displays home screen.

    • | Parameter | Value | |-----------|-------| | Supply voltage | 24 VAC ±10%, 50/60 Hz, 40 VA (gateway) | | Analog inputs (DDC-5) | 8× 0–10 VDC or 4–20 mA (jumper selectable), 12‑bit resolution | | Digital outputs | Relay: 240 VAC, 5 A resistive; Triac: 0.5 A | | Real‑time clock drift | ±2 s/day (sync via NTP possible) | | Non‑volatile storage | 8 GB eMMC (log capacity: ~2 years @ 15‑min interval) |

    Enable Batch History and User Action Logging: A phase is the smallest executable action

    Industrial systems are prime targets. Despite being an internal manual, security must be embedded.

    Access via HMI or http://<controller-ip>:8080/diag.