Siemens PXC16.2-E-A Digital Controller

モデルコードの内訳

オフィシャルモデル: PXC16.2-E.A (PXC16.2-E-A is the common industry notation)

PXC: APOGEE Compact Series DDC (Direct Digital Controller) のために ビルディングオートメーション

16: 合計 16 integrated I/O points onboard

.2: Second-generation hardware revision

E: BACnet/IP Ethernet Automation Level Network (ALN) (10/100M Ethernet)

あ: Standard temperature variant (non-rooftop extended temperature model)

Reference for model differentiation:

PXC16.2-P.A: RS485 BACnet MS/TP version

PXC16.2-EF.A: Ethernet with FLN field bus support (requires license)

PXC16.2-EF32.A: Ethernet with FLN bus, までサポート 32 FLN devices

I/O Point Definition (TX-I/O™ Software Configurable)

合計: 16 integrated I/O points with adaptive signal configuration

Point Type	量	説明
UI Universal Input	3	Resistive sensors, 0–10V, 4–20mA, pulse digital input
U Universal I/O	5	Configurable as input / 0–10V analog output / digital input
DI Digital Input	2	ドライ接点入力
AOV Analog Output	3	0–10V DC analog output
DO Digital Output	3	Relay contact output (for AC24V loads)

✅ Supported sensors: 1k Nickel, 1k Platinum, 10K/100K NTC thermistors, 0–10V, 4–20mA transmitters

Core Hardware & 電気仕様
電源: AC24V, power consumption ≈18 VA
プロセッサー: MPC852T, 100 MHz クロック速度
メモリ: 16MB for program & data storage; built-in lithium backup RTC clock (typical service life: 10 年)
AD/DA Conversion: 16-bit ADC sampling, 10-bit DAC output
取り付け: DIN rail mounting or direct screw mounting; pluggable terminal blocks
重さ: 約. 0.91 kg
環境条件

動作温度: 0 ℃～ +50 ℃ (Standard Type A)

Condensation, heavy dust and strong electromagnetic interference are prohibited

認証: BTL certified, BACnet B-BC profile compliant
通信インターフェース
イーサネット (Primary ALN): BACnet/IP, 10/100Base-TX
Local Commissioning Ports

USB-B device port (試運転, program download/upload)

RS232 HMI port for direct laptop connection

FLN Bus: No onboard hardware FLN interface; select EF/EF32 variants if external field sensor modules are required
ソフトウェア & Programming Ecosystem (Critical Note)

Belongs to APOGEE Insight Building Management System

Programming Language: PPCL (APOGEE Proprietary Control Language)

Commissioning Tools:

Insight (Supervision + programming integrated platform)

CT (Controller Tool, standalone commissioning software)

⚠️ Important Distinction: Incompatible with new-generation Desigo ABT Site software. ABT Site is designed exclusively for Desigo PXC4/PXC5/PXC7 and cannot be used for legacy APOGEE PXC Compact controllers.

典型的なアプリケーションシナリオ

Air Handling Units (AHU), Primary Air Units (PAU), chiller auxiliary control, heat exchanger stations, small plant rooms, packaged air handlers, fan coil group control. Ideal for independent DDC control of medium & small HVAC equipment.

製品ライフサイクル & 交換オプション
状態: APOGEE PXC Compact series Obsolete (製造中止). Only stock / second-hand units available; no official hardware upgrade variants released by シーメンス.
No direct cross-compatibility between old and new platforms (Incompatible programming software, control logic and program migration)

Recommended New Generation Replacement (Desigo Platform)

Desigo PXC4.E16: 16-point Ethernet BACnet/IP DDC, mainstream modern controller, programmed via ABT Site

注記: Similar I/O count, but all control programs must be rewritten; PPCL programs cannot be migrated directly.

Common Pitfalls & 選定ガイドライン
Do not confuse PXC16.2-E.A (イーサネット) vs PXC16.2-P.A (485 MS/TP); hardware communication circuits are incompatible.
This model has no native FLN bus interface. Select EF32 variant if TX-I/O field expansion modules are required.
Expired backup battery only causes real-time clock loss; stored control programs remain intact.
DO relay contacts cannot drive high-power contactors directly; interposing relays are mandatory.
When wiring 4–20mA transmitters to universal points, verify external power supply configuration to avoid channel burnout.

Supplementary ④: 故障コード, Root Causes & On-site Troubleshooting for Siemens PXC16.2-E-A

4.1 System Fault Code Table (Common to all PXC16 firmware revisions)

故障コード	障害の説明	根本的な原因	Standard Remedial Procedures
Err01	Undervoltage Alarm	AC24V supply voltage drop, 端子の緩み, insufficient power capacity	1. Measure AC24V at controller terminals; 2. Check cable voltage drop; 3. Tighten terminal screws; 4. Use dedicated transformer; avoid sharing low-capacity power supply among multiple devices
Err02	Memory Checksum Error	Corrupted program, flash memory failure, uncontrolled power cycling	1. Re-download PXC program; 2. Factory reset and reflash firmware; 3. Replace controller if error recurs persistently (hardware fault)
Err03	Analog Input Out-of-Range	Sensor open circuit, 短絡, mismatched signal type	1. Inspect sensor wiring; 2. Verify configured signal type (NTC / 4–20mA); 3. Terminate unused analog channels
Err04	LON Bus Communication Fault	LON short circuit, missing terminating resistors, 逆極性	1. Install 105Ω terminating resistors at both bus ends; 2. Check cable insulation damage & 短絡; 3. Isolate faulty bus nodes
Err05	Output Overload Alarm	Shorted DO contacts, excessive load current	1. Disconnect external load and retest; 2. Add interposing relay for relay outputs; 3. Do not directly drive large solenoid valves
Err06	RTC Clock Failure	Depleted internal backup battery	症状: Time resets after power loss. The controller can still run, but cannot retain time. Full replacement recommended for long-term operation.
Err07	Watchdog Reset	Program infinite loop, electromagnetic interference, firmware bugs	1. Optimize PPCL control logic; 2. Separate power cables and signal cables; 3. Upgrade to official stable firmware
Err08	Module Over-Temperature	Poor cabinet ventilation, ambient temperature exceeding 55°C	1. Improve enclosure cooling; 2. Avoid mounting adjacent to VFDs and contactors; 3. Reduce cabinet operating temperature

4.2 High-Frequency On-site Troubleshooting Procedures

Controller fails to power up, all indicators off
Disconnect all external wiring, power the controller standalone to distinguish load short circuit or internal hardware failure
Confirm supply voltage is AC24V. DC24V / AC220V will cause permanent damage
No reverse-polarity protection for power terminals L/N. Avoid reversed wiring.
Program download failure
Communication cable: Crossed RS232 commissioning cable required
CT tool communication parameters: 9600 baud, 8N1, パリティなし
Close other serial port software occupying COM port; prioritize FTDI USB-to-serial adapters for industrial PCs
Firmware version must match program; mismatched firmware leads to download interruption
No actuation from output points
Distinguish between software interlock / manual-auto mode / hardware circuit fault
DO channels provide dry contacts only; external power supply is required for load circuit
AO analog outputs require load impedance above minimum specification to prevent signal collapse

4.3 Strict Installation & Commissioning Prohibitions

❌ Never route AC220V cables to controller I/O terminals; immediate channel burnout
❌ Run power cables and sensor wiring within the same cable tray; causes interference and signal drift
❌ Omit LON bus terminating resistors; leads to intermittent communication loss
❌ Missing cabinet protective earthing; static electricity triggers random controller resets
❌ Hot-plug I/O wiring frequently; risk of buffer chip breakdown

4.4 メンテナンスに関する推奨事項

Annual inspection: 電源電圧, 端子の気密性, cabinet temperature & 湿度, LON wiring
Back up PXC program files (.pxc) regularly for critical projects; source code cannot be recovered once hardware fails due to product obsolescence
このモデルは生産終了です; full unit replacement is preferred upon hardware failure. No spare parts available for component-level repair.

Typical Application Cases of Siemens PXC16.2-E-A (APOGEE Insight System, BACnet/IP Ethernet Model)

コアの位置決め: 16-point compact DDC for independent control of single medium/small HVAC equipment. Built-in Ethernet, suitable for distributed plant room layout and standalone control cabinets. No native FLN bus, not recommended for large numbers of external P1 field devices.

Precondition for selection: Total I/O ≤16 points, standalone equipment control, access to building LAN via BACnet/IP. Upgrade to PXC24.2 / PXC36 for higher point count requirements.

場合 1: Primary Air Unit (PAU) on Typical Office Floors (最も一般的なアプリケーション)

プロジェクト概要

Grade A office building, each floor equipped with one Primary Air Unit (PAU), 合計 22 単位. Building Automation System adopts Siemens APOGEE Insight. PXC16.2-E-A deployed for each air handling unit for independent control.

I/O Allocation (Fully utilizing native 16-point TX-I/O)

DI Digital Inputs

Supply fan run status feedback
Supply fan fault alarm
Filter differential pressure alarm

UI Universal Inputs

Outdoor air temperature
Supply air temperature
Supply air humidity

U Universal Configurable Points

Return air CO₂ concentration
Freeze protection switch signal

AOV Analog Outputs

Chilled water control valve
Hot water control valve
Fresh air damper actuator

DO Digital Outputs

Supply fan start/stop control
Unit freeze protection alarm output
Electric preheat contactor control

制御機能

PID constant supply air temperature control; fresh air damper modulated in response to CO₂ concentration
Seasonal mode switching: cooling via chilled water in summer, 加熱 & humidification via hot water in winter
Freeze protection interlock: close fresh air damper, fully open hot water valve at low temperature
Scheduled start/stop, fault alarm upload, 履歴データのロギング
Uinterrupted standalone operation after power recovery; independent of upper workstation

Selection Justification

Point count matches compact PAU without additional expansion modules

Native Ethernet for direct connection to building switch, 簡単な配線

No FLN device required; EF variant unnecessary

Limitation Reminder

Additional humidifier or VFD feedback signals will exceed available points. Upgrade to PXC24.2 for future expansion.

場合 2: Exhaust Fan / Car Park Induced Ventilation Control for Shopping Mall

プロジェクト概要

Underground parking of shopping complex, divided into multiple ventilation zones. Each zone ventilation package controlled by one PXC16.2-E-A.

制御ロジック

Fan start/stop & speed modulation linked to car park CO concentration; full exhaust damper opening triggered by fire alarm signal; fan fault monitoring, hand-auto switchover.

Brief I/O List

から: Fan status, 故障, fire dry contact signal, CO detector

する: Fan contactor, audible/visual alarm

へ: Fan VFD signal, exhaust air damper

利点

Distributed equipment rooms in parking area simplify Ethernet networking; compact DDC delivers cost-effective solution for low-point-count zone ventilation.

場合 3: Small Air Handling Unit (AHU) for Outpatient Departments in Hospital

プロジェクト概要

Small purification AHU for consultation rooms in Grade 2 病院, requiring precise temperature & humidity control for basic medical ventilation.

Special Control Requirements

Constant supply air temperature & humidity PID regulation
Filter differential pressure alarm for maintenance reminder
Hardwired interlock with fire alarm system; unit shutdown upon fire signal
Continuous long-term stable operation

Selection Highlights

APOGEE PXC series widely deployed in healthcare projects for proven reliability. PXC16.2-E-A Ethernet interface supports seamless integration into hospital BMS intranet.

⚠️ Operating rooms, ICUs and high-grade purification air handlers require more control points; PXC36 is recommended instead of PXC16.

場合 4: Secondary Side Plate Heat Exchanger Control for Industrial Park Heat Station

プロジェクト概要

Small heat substation in industrial park, monitoring and regulation of single plate heat exchanger.

I/O構成

から: Circulation pump run status, pump fault

UI: Primary supply/return water temperature, secondary supply/return water temperature

へ: Primary side heating water control valve

する: Circulation pump start/stop, over-temperature alarm

Control Strategy

PID regulation to maintain constant secondary supply water temperature; low-temperature freeze interlock; time-based heating setpoint adjustment.

Application Boundary

Only applicable to single heat exchanger + single circulation pump small heat station. Select PXC36 for multi-unit large heat stations.

場合 5: Combined Air Handler + Public Lighting Integrated Control for Hotel Back-of-House

プロジェクト概要

Budget hotel service plant room. One PXC16.2-E-A controls small AHU together with corridor public lighting.

Hybrid Control Functions

Supply air temperature control for air handling unit
Scheduled automatic switching of public lighting, linkage with motion sensors
Unified fault alarm upload for all equipment

注記

Reserve 2~3 spare I/O points for renovation when mixing HVAC and lighting control.

❌ Unsuitable Scenarios for PXC16.2-E-A (Selection Avoidance Guide)

Large quantity of external P1 FLN sensors/actuators required → select PXC16.2-EF-A with FLN license
AHU equipped with VFD, humidifier, reheat coil and multiple dampers; total I/O 16 points → PXC24.2 / PXC36
Outdoor rooftop installation requiring extended temperature range → select dedicated rooftop variant
Massive remote I/O expansion required; no native TX-I/O expansion bus onboard

✅ General Project Implementation Experience (すべてのケースに適用可能)

Network Architecture: PXC16.2-E-A → LAN Switch → Insight Server (BACnet/IP)
試運転: Program download via RS232 local connection using CT tool
Spare Parts Note: このモデルは生産終了です. New construction projects prefer Desigo series. Renovation & maintenance projects may source surplus/second-hand stock.
Program Migration: Legacy PXC PPCL programs cannot be imported directly to new Desigo controllers; full control logic rewriting is mandatory.