SAIA PCD4.W500 (Analog Input Module) and PCD4.W600 (Analog Output Module)

SAIA PCD4.W500 (Analog Input Module) and PCD4.W600 (Analog Output Module)

Overall positioning and common characteristics of the product

PCD4.W500 and PCD4.W600 are two industrial grade intelligent simulation modules launched by SAIA, designed specifically for signal acquisition and control output in industrial automation scenarios. The two share the following core commonalities:

Isolation and anti-interference: Both have galvanic isolation (500VDC/1min between PCD-GND and module GND), strong anti-interference ability, suitable for complex industrial environments;

Modular design: It needs to be paired with PCD7. W series range modules to achieve specific signal type adaptation and support flexible combination;

Intelligent function: Built in microcontroller, capable of locally executing measurement, scaling, comparison and other functions without occupying PCD main CPU resources;

Programming support: compatible with IL (instruction list) and FUPLA (function block) programming, relying on PG4 software and dedicated FB (function block)/FBox (function box);

Configuration Storage: Configuration parameters are stored in EEPROM and automatically loaded during startup, supporting hot/cold start initialization;

Communication address: occupying 16 I/O addresses, selecting channels, data, or status through address lines, supporting Busy signal synchronization.

Core details of PCD4.W500 (analog input module)

（1） Core technical specifications

Specific specifications and key numbers of parameter items

Resolution single trigger/continuous mode 12 bit/12/15 bit

Input channel voltage/current/thermal resistance 8 channels/4-8 channels

Conversion time single trigger/continuous 100 µ s/65 µ s

Accuracy full-scale error ± 0.25% ± 2LSB

Temperature error: Environmental temperature impact ± 0.02%/℃

Overvoltage protection analog input 60VDC

Current consumption internal (+5V)/external (+24V) 150mA/100mA

（2） Support signal type and range module

Signal Type Range Module Measurement Range Digital Representation

Voltage PCD7. W100 0~10V/± 10V 0~4095/± 10000

Voltage PCD7.W101 0~1V/± 1V 0~4095/± 10000

Current PCD7. W103 0~20mA/4~20mA 0~4095/819~4095

Current (two-wire system) PCD7.W104 4~20mA 819~4095

Thermistor (2-wire) PCD7.W110/W111 Pt1000/Ni1000 (-50~150 ℃) -500~1500 (0.1 ℃ accuracy)

Thermistor (4-wire) PCD7.W101+W120 Pt100/1000, Ni100/1000-500~1500 or 0~6000

（3） Core intelligent functions

Measurement Mode

Single trigger mode: default configuration, triggering conversion when querying, 12 bit resolution;

Continuous mode: cyclic conversion, storing the latest values, supporting 12 bit (low resolution) or 15 bit (high resolution), including 50/60Hz interference suppression.

data format

Bit format: Directly output AD conversion value (0~4095/0~32767);

Proportional format: Convert to physical units (such as 10V → 0~10000, 20mA → 0~20000);

Temperature format: Automatic linearization, converted to 0.1 ℃ units (e.g. -50 ℃ → -500);

User zoom: supports custom range (0~32767) and offset (-16384~+16383).

**Comparator function * *: Each channel supports 2 limit values (A/B) and 8-bit lag (0~255), enabling window comparison and outputting status bits (value>A/B, A XOR B).

Fault detection: Output scaling errors, disconnections/shorts, channel errors, internal faults (CPU/RAM/EPROM, etc.) through status registers.

Core details of PCD4.W600 (analog output module)

（1） Core technical specifications

Specific specifications and key numbers of parameter items

Resolution digital output range of 12 bits (0~4095)

Output channel grouping design with 8 channels (4 groups x 2 channels), short circuit protection

Conversion time voltage (resistive/capacitive load)/current 0.1ms/0.8ms/0.3ms

Precision voltage/current (4mA point) ± 0.15% ± 5mV/± 0.2% ± 20 µ A

Linear error voltage/current ± 0.05%/± 0.1%

Load impedance voltage/current>23k Ω/0~500 Ω

Current consumption internal (+5V)/external (+24V) 200mA/100mA+20mA/current output

（2） Support signal type and range module

Signal Type Range Module Output Range Digital Representation

Voltage: PCD7-W300 0~10V 0~10000

Voltage: PCD7-W302 ± 10V -10000~10000

Current PCD7-W304 0~20mA 0~20000

Current PCD7-W305 4~20mA 4000~20000

（3） Core intelligent functions

output mode

Single output mode: default configuration, directly writing and outputting values;

Synchronous update mode: Preload the value (WrPreVal) first, and trigger all channel updates synchronously through the Control command (code 0), with an inter channel delay of ≈ 75 µ s.

data format

Bit format: Directly output DA conversion value (0~4095);

Proportional format: Convert to physical units (such as 10V → 0~10000, 20mA → 0~20000);

User scaling: Supports custom range (0~32767) and offset (-16384~+16383), with priority over range modules.

Intelligent recognition: automatically recognizes installed range modules (read through RdInfo FB), supports hot swappable configuration.

Fault detection: Output scaling errors, range module not installed, channel errors, internal faults (DA converter/EEPROM, etc.) through the status register.

Programming and Configuration Points

（1） Mode switching

Standard mode: When the microcontroller is not configured, it is compatible with ordinary analog modules and does not require FB. It can be read and written directly through I/O addresses;

Expansion mode: To enable the intelligent function, it needs to be configured through FB/FBox, and the configuration parameters are stored in EEPROM. After modification, the checksum needs to be reset to 0.

（2） Comparison of core FB functions

Module Type Core FB Function Description

PCD4. W500 RdValUp unipolar read input value (e.g. 0~20mA)

RdValBp bipolar reading input value (such as ± 10V, temperature)

RdStatus reads channel status (error/comparison result)

Config batch configuration channel parameters (stored in DB)

Control sends control commands (restart/self-test/50/60Hz suppression)

PCD4.W600 WrVal writes single channel output value

WrPreVal preloads synchronized update values

RdStatus reads channel status (error/module status)

Config batch configuration channel parameters (stored in DB)

Control sends synchronous update/restart/self-test commands

（3） Configuration precautions

The configuration DB should be of RAM type (recommended DB 4000~7999), with the first byte storing the checksum. After modifying the configuration, the checksum should be set to 0;

Initialization is recommended to be executed in XOB16 (cold start) to ensure that the configuration takes effect;

Unused channels need to be configured as "single trigger mode" (code 0000H) to avoid interference;

The base address should be an integer multiple of 16 (0, 16, 32...), avoiding the use of 240 and 496 (which conflicts with watchdog).

Typical application scenarios

PCD4.W500: Industrial site temperature (Pt100/Pt1000), pressure (4-20mA), flow (0-10V) signal acquisition, suitable for automated production lines, HVAC systems, and process control;

PCD4.W600: Control signal output for actuators (such as valves and motors), analog signal simulation, and control quantity output for closed-loop control systems, suitable for chemical, metallurgical, and intelligent manufacturing scenarios.