SAIA PCD1 Controller Full Series

SAIA PCD1 series programmable controller: compact automation core

In the fields of building automation, industrial control, and energy management, there are increasingly high requirements for the flexibility, communication capabilities, and cost-effectiveness of controllers. Saia PCD1 series as Saia PCD ®  The smallest flat programmable controller in the family, with powerful CPU, integrated I/O, rich communication interfaces, and modular expansion capabilities, provides an ideal solution for small to medium-sized automation tasks. This article will provide a comprehensive and in-depth technical analysis of the system from the perspectives of series overview, technical specifications of the three main sub series (PCD1.M2xxx, PCD1.Room, PCD1 E-Controller), I/O configuration, communication expansion, installation methods, and typical applications.

Overall positioning of PCD1 series

The Saia PCD1 system adopts a compact and flat design, with all controllers integrated with at least 18 I/O points, and comes standard with data storage, Web/IT functionality (automation server), and multiple standard communication interfaces. Its powerful CPU is capable of successfully addressing small automation challenges. Rich communication options: Ethernet TCP/IP, USB port, onboard RS-485 interface, and via BACnet ®  Or extension options such as Lon IP fully demonstrate the performance potential of PCD1.

According to application scenarios, the PCD1 series is divided into three main branches:

PCD1.M2xxx: Universal compact controller, modular expansion, suitable for small and medium-sized equipment and renovation projects.

PCD1. Room (M2110R1): A controller designed specifically for room automation and HVAC (HeaVAC), suitable for indoor installation.

PCD1 E-Controller (M0160E0): An energy monitoring controller specifically designed for installation in distribution boxes, pre installed with S-Monitoring functionality.

PCD1.M2xxx Series: Compact and Scalable Universal Controllers

The PCD1.M2xxx series is a compact controller with onboard I/O and two additional I/O slots (for PCD2 I/O modules or communication interface modules). Its web/IT functionality, onboard storage, standard communication interfaces, and expansion options provide a good solution for small and medium-sized devices.

2.1 System Characteristics

Up to 50 inputs/outputs can be expanded (in conjunction with RIO PCD3.T66x or T76x)

Up to 8 communication interfaces

Onboard USB and Ethernet interfaces

Large capacity onboard program storage (up to 1 MByte) and data storage (up to 128 MByte file system)

Automated server, integrated with web/IT systems (Flash file system, FTP, web server, etc.) Email、SNMP）

2.2 Model and Memory Configuration

Model Program Flash User RAM File System

PCD1.M2160 (with Ethernet) 1 MB 1 MB 128 MB

PCD1.M2120 (with Ethernet) 512 kB 128 kB 8 MB

PCD1.M2020 (without Ethernet) 512 kB 128 kB 8 MB

2.3 Integrated Communication

Ethernet: 10/100 Mbit/s, dual port switch, full duplex, adaptive, auto crossover (M2160/M2120 only)

USB: USB 1.1 device, 12 Mbit/s

RS-485: Through terminal X3, up to 115 kbit/s

2.4 Onboard I/O (all M2xxx models)

Input:

6 digital inputs (2 of which can be interrupted): 15... 30 VDC, input filtering 8 ms/0.2 ms (optional), terminal X1

2-channel analog input (selected through DIP switch): -10...+10 V, 0... ± 20 mA, Pt1000, Ni1000, Ni1000 L&S, 0... 2.5 k Ω, 12 bit resolution, terminal X1

output:

4-channel digital output: 24 VDC/0.5 A, terminal X0

1-channel PWM output: 24 VDC/0.2 A, terminal X0

Configurable (via PG5 software):

4-channel digital input or output (terminal X0): 24 VDC, can be used as input or output

1-channel watchdog relay or normally open contact: 48 VAC/VDC, 1 A (DC inductive load requires parallel freewheeling diode), terminal X3

2.5 Power Supply and General Parameters

Supply voltage: 24 VDC (-20%/+25%), with a maximum ripple of 5%, in compliance with EN/IEC 61131-2

Data backup battery: lithium button battery CR2032, with a lifespan of 1-3 years

Working temperature: 0... 55 ° C

Dimensions (W × H × D): 142 × 226 × 49 mm

Installation method: Two 35mm top cap rails (DIN EN60715 TH35) or flat installation

Protection level: IP20

Internal 5V bus capacity: maximum 500 mA; Internal 24V capacity: maximum 200 mA

Typical power consumption: 12 W

2.6 I/O and Communication Expansion

Slot I/O 0 and I/O 1: Can be inserted into PCD2.M5 series I/O modules or PCD2.F2xxx communication interface modules (up to 2 F2xxx modules, providing up to 4 interfaces).

Slot A: Can accommodate PCD7. F1xxx communication expansion modules (such as RS-232, RS-485/422, Belimo MP Bus, etc.).

Slot M1: Can insert PCD7.Rxxx memory modules for expanding file systems or activating BACnet IP/LON IP firmware.

New analog output module PCD7.W600 (12 bits, 0... 10V, developed specifically for PCD1, inserted into slot A).

2.7 Supported Communication Expansion Modules (Partial)

PCD7.F1105: Non isolated RS-485/RS-422, 40 mA (5V)

PCD7. F1215: RS-232 (including hardware handshake), 15 mA, supports modems EIB

PCD7. F1505: Isolation type RS-485, can activate terminal resistor, 130 mA

PCD7.F1805：Belimo MP‑Bus， Up to 8 drivers, 15 mA+15 mA (24V)

PCD2.F2100: RS-422/485+optional PCD7.F1xS, 110 mA

PCD2.F2150: BACnet MS/TP RS-485+optional PCD7.F1xS

PCD2.F2210: RS-232+optional PCD7.F1xS

PCD2.F2400：LonWorks ®  interface module

PCD2.F2610: DALI master station, up to 64 DALI devices

PCD2. F27x0: M-Bus master station, dual M-Bus interfaces, 70 mA (5V)+8 mA (24V)

PCD2.F2810: Belimo MP-Bus+optional PCD7.F1xS

2.8 Typical Applications

Automation and Control of Small and Medium sized Devices

Modernization and functional enhancement of existing equipment

As a gateway connecting different bus systems (such as EIB/KNX, M-Bus, Modbus)

Optimize free parameters such as cooling system and heating system

EIB/KNX integration providing web connectivity for conference rooms

As an M-Bus communication interface in regional heating networks

PCD1. Room (M2110R1): Room Automation Dedicated Controller

PCD1. Room is a programmable room controller designed specifically for complex room automation and HVAC solutions, providing a wide range of communication options. In addition to integrated I/O, it also provides a free I/O slot for personalized expansion (input/output or communication). The onboard web/IT functionality supports mobile operations. This controller can achieve efficient room automation that complies with EN 15232:2012 energy efficiency levels.

3.1 Technical specifications (main differences from M2xxx)

Program memory: 256 kB Flash

User memory: 128 kB RAM

File System: 8 MB

Integrated communication: Ethernet dual port switch, USB, RS-485 (same as M2xxx)

Automated server: supports Flash, file system FTP、Web、Email、SNMP

3.2 Onboard I/O (Enhanced)

Input:

6-way digital input (4+2 interrupt), same as M2xxx

2-channel universal analog input (terminal X1): -10...+10 V, 0... ± 20 mA, Pt1000, Ni1000 L&S, 0... 2.5 k Ω, 12 bits

4-channel dedicated analog input (EA 1 slot): 0... 10 V, 0 (4)... 20 mA, Pt1000, Pt500, Ni1000, 14 bit resolution

output:

4-channel digital output (24 VDC/0.5 A)

1 PWM output (24 VDC/0.2 A)

2-channel analog output (EA 1 slot): 0... 10 V or 0 (4)... 20 mA, 12 bits, configurable through PG5

Configurable (via PG5):

4-channel digital input/output (terminal X0)

Watchdog relay (terminal X3)

3.3 Expansion Limitations and Special Instructions

Only supports one I/O slot (I/O 0): can be inserted into a PCD2.M5 I/O module or a PCD2.F2xxx communication module (up to 1 F2xxx module).

Slot I/O 1 pre installed with PCD2.W525 module: This module is part of the default configuration of the controller, and if removed, the controller will stop running. Therefore, users are not allowed to freely expand using the I/O 1 slot.

The Smart RIO Manager feature is not supported.

Supports S-Bus and Modbus stations, with a maximum of 10 units.

3.4 Communication Expansion and Memory Expansion (Same as M2xxx Series)

Slot A: PDC7.F1xxx Communication Expansion

Slot M1: PCD7.Rxxx flash module, can activate BACnet IP or LON IP

Slot I/O 0: Optional PCD2.F2150 (BACnet MS/TP), PCD2.F2400 (LON FTT10), etc

3.5 Typical Applications

Radiators, fan coil units, cooling ceilings, VAV (Variable Air Volume) control

Air quality monitoring

Signal contacts (occupancy control, presence detection, window monitoring)

Lighting control, sunshade control

Connect external devices through analog signals, S-Bus, Modbus, BACnet, LON, KNX IP, EnOcean, etc

PCD1 E-Controller (M0160E0): Energy Monitoring Controller for Distribution Box

PCD1.M0160E0 is a compact controller with free programming, pre installed with S-Monitoring application (energy monitoring) at the factory. It is designed specifically for the installation of electrical control cabinets, suitable for distribution units or narrow spaces. In addition to integrating I/O, interface, and Web/IT functions, it also supports multiple protocol connections, making it highly suitable for microcontrollers, communication gateways (EnOcean, KNX, BACnet, etc.), as well as energy consumption data collection, recording, and processing.

4.1 Technical specifications

Program memory: 1 MB Flash

Working memory: 1 MB RAM

File System: 128 MB

Integrated communication: Ethernet (dual port switch), USB, RS-485 (as before)

Automated Server: Supports

Dimensions (W × H × D): 142 × 142 × 60 mm (excluding terminals)

Installation method: Single 35mm top cap rail (DIN EN60715 TH35) or flat installation

4.2 Onboard I/O

Input:

6-way digital input (4+2 interrupt), 15... 30 VDC

2-channel analog input (terminal X1): -10...+10 V, 0... ± 20 mA, Pt1000, Ni1000, Ni1000 L&S, 0... 2.5 k Ω, 12 bits. The default factory configuration is Ni1000 sensor input.

output:

4-channel digital output (24 VDC)

1 PWM output (24 VDC/0.2 A)

Configurable (via PG5):

4-channel digital input or output (terminal X0), factory default configuration is digital input

Watchdog relay (terminal X3)

Note: This model does not have a free I/O slot (no EA slot), only one slot A is used for communication expansion.

4.3 Special Installation Requirements

When installed in the distribution box, a space of 55mm should be left above the DIN rail and 75mm below it.

It is recommended to use elbows or flexible Ethernet cables (such as SlimWire PRO) for Ethernet cables, otherwise it may not be possible to close the distribution box cover.

4.4 Communication and Storage Expansion

Slot A: Supports PCD7.F1105, F1215, F1505, F1805 communication modules (RS-485, RS-232, MP-Bus, etc.).

Slot M1: Supports PCD7.R550M04 (4 MB file system), R560/R562 (BACnet firmware), R580/R582 (LON IP firmware), and PCD7.R610 Micro SD card dock (compatible with PCD7.R-MSD1024).

Parallel running of S-Monitoring and BACnet/LON: Follow the official support page instructions.

4.5 Typical Applications

As a microcontroller or communication gateway (such as converting EnOcean wireless signals to BACnet IP)

Energy consumption data collection, recording, and processing (electricity meters, water meters, gas meters)

Local automation logic inside the distribution box (such as lighting control, radiator control)

Integrate with Building Management System (BMS) through BACnet or LON

General accessories and options

5.1 Labels and EPLAN Macros

Self adhesive labels can be directly printed through the SBC LabelEditor of the PG5 device configurator.

The EPLAN Electric P8 macro can be obtained from the support page or EPLAN data portal for easy engineering planning.

5.2 Backup Battery

Model: 4 507 4817 0 (RENATA CR2032 lithium button battery)

5.3 Pluggable screw terminal block

X0: 11 needles, marked 0... 10 (order number 4 405 5089 0)

X1: 9 needles, marked 11... 19 (order number 4 405 5087 0)

X2:10 needle, marked 20... 29 (order number 4 405 5088 0)

X3:10 needle, marked 30... 39 (order number 4 405 4919 0)

5.4 Shell cover plate

Logo free cover plate (4 104 7759 0) for PCD1.M2xxx, which can be personalized with on-site film application.

Programming and software support

All PCD1 controllers are programmed using the Saia PG5 programming software suite, which supports IEC 61131-3 languages such as Instruction List (IL), Function Block Diagram (FBD), Structured Text (ST), and Sequential Function Diagram (GRAFTEC). The automated server function allows users to create embedded web pages, monitor and modify process variables through a browser. The S-Monitoring function (pre installed on the E-Controller) provides visualization, trend recording, and alerting of energy consumption data.

Summary of System Integration Capability

The PCD1 series achieves extensive system integration through the following methods:

Fieldbus: Modbus RTU（RS‑485）、BACnet MS/TP、LON FTT10、M‑Bus、DALI、Belimo MP‑Bus

Building bus: KNX (via IP or external coupler) EIB

Ethernet protocols: BACnet IP, LON IP, Modbus TCP, HTTP (Web Server) FTP、SNMP、Email

Wireless: EnOcean (via external receiver)

Exclusive: S-Bus (Saia's own bus)

Selection Guide and Precautions

Requires large capacity program storage, file system, and dual Ethernet switch: Choose PCD1.M2160.

Only basic Ethernet connection is required, budget is limited: choose PCD1.M2120.

No Ethernet required, only use RS-485 or USB: choose PCD1.M2020.

Room automation applications require a large number of analog inputs/outputs and dedicated room functions: choose PCD1.M2110R1 (note that there is only one free I/O slot and the W525 module is pre installed).

Energy monitoring, distribution box installation, gateway function: Select PCD1.M0160E0 (no I/O expansion slot, but pre installed with S-Monitoring).

Expand communication interface: Select the PCD7.F1xxx or PCD2.F2xxx module according to the required protocol, and pay attention to the 5V bus current limit (maximum 500 mA).

Expand file system or activate BACnet/LON IP: Use the M1 slot's PCD7.Rxxx flash module.