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Simple series CODESYS-SP18 platform CPU : C821

Order No.:CTSI-C821-16N1

Specification:Simple series motion control basic host, 24VDC power supply, 8DI/8DO transistor drain output,Supports 8 axis EtherCAT

Product Description

Simple series motion control basic host, 24VDC power supply, 8DI/8DO transistor drain output, 2 Gigabit network ports (support

 switch function), 1*EtherCAT(support setting independent IP), 1*RS485 port; Support 4 200KHZ motion control output pulse shaft,

 4 200KHZ high-speed counting, can be arbitrarily allocated use points; Support EtherCAT operation control bus 8 axis, support 

72 EtherCAT slave station; Body two expansion card slots (support expansion RS485\CAN\ analog RTC\4G); Locally extensible 16 

modules; Type-C interface (can be powered for quick download and debugging, update program and update firmware through U 

disk) support SoftMotion, CNC, visual WebVisu, OPC-UA, EtherNet/IP master station, Codesys label communication function :32M 

program data space, 512KB power-off hold;

CODESYS-SP18 platform


Technical Spec
ModelCTSI-C821-16N1CTSI-C823-16N1
Power Supply Specification
Rated Input Power Supply Voltage24V DC(20.4V~28.8V)
Rated Input Power Supply Current1A
Input Power Supply ProtectionSupports Reverse Polarity Protection
On-board Hardware Specification
Dimensions(W×H×D)53×104×80 mm
Digital Input8DI
Digital Output 8DO
Bus Interface1
Ethernet2
EtherCAT1
RS485Supports up to 5 channels (1 channel on main unit, expandable to 2 channels on expansion unit)
Type‑C1
Expansion Slot2
Memory Specification
Program Capacity32M Byte32M Byte
Data Memory SpecificationI Area: 32K, Q Area: 32K, M Area: 512K
Power-off Memory512K Byte512K Byte
Expansion Capability
Expansion Modules16 (Fully compatible with the entire simple series on the main unit) * *For weighing module adaptation, please contact the manufacturer separately
Expansion CardsSupports analog quantity, CAN, RTC, serial port, and 4G
(4G expansion card will be added in the subsequent version)
Programming Software Specification 
Software VersionCODESYS SP18 (3.5.18.50)
Programming LanguagesCFC/FBD/LD/IL/ST/SFC
Instruction Cycle
Logic Instructions0.015us
Floating-point Instructions0.07us
Motion Control
Maximum EtherCAT Axes832
Axis Capacity 8 axes / 1ms32 axes / 2ms
Pulse Axes44
SoftMotionSupportedSupported
CNCSupportedSupported
Input Specification — Hardware Parameters
Input Points8
Input TypeSink / Source
Rated Load Input Voltage24V DC( 20.4V~28.8V DC )
Maximum Load Cable LengthShielded - 500m (standard input), 50m (high-speed counter input)
Unshielded - 300m (standard input)
Logic 1 (Minimum)15V DC,>2.5mA
Logic 0 (Maximum)5V DC,<1mA
Input FilterConfigurable, supports 0.2us, 0.4us, 0.8us, 1.6us, 3.2us, 6.4us, 12.8us, 0.2ms, 0.4ms, 0.8ms, 1.6ms, 3.2ms, 6.4ms, 12.8ms. The default value is 6.4ms.
Software FunctionSupports hardware movement in the program without modifying the software program after point damage
Protection FunctionSurge voltage -35V DC, duration 0.5s
Maximum Allowable Leakage Current1mA
Isolation500V AC,1 minute
Input Specification — HSC Parameters
Input Circuits4
Single-phase Counters4×200KHz
Dual-phase Counters4×100KHz
Function DescriptionSupports arbitrary modification of points, supports internal pulse capture
Output Specification — Hardware Parameters
Output Points8
Output TypeTransistor sink output
Rated Output Voltage24V DC(20.4~28.8V DC)
Rated Output Current0.5A
Output LoadResistive load — 0.5A/point, 2A/8 points
Inductive load — 7.2W/point, 24W/8 points
Electric lamp load — 5W/point, 18W/8 points
Output FrequencyResistive load——200KHz
Inductive load——0.5Hz
Electric lamp load——10Hz
Turn-on to Turn-off (Delay)
Turn-off to Turn-on (Delay)
<0.2us
<2us
Maximum residual voltage during ON state
Leakage current during OFF state
<0.5V DC
<30uA
Maximum Load Cable LengthShielded ——500m
Unshielded ——150m
Software FunctionSupports hardware movement in the program without modifying the software program after point damage
Protection FunctionShort-circuit protection, overcurrent protection
Isolation500V AC,1 minute
Output Specification — HSP Parameters
Output Circuits4(Pulse/Direction)
Output Frequency200KHz
Function DescriptionSupports arbitrary modification of points, configuration of pulse axes, adjustable delay for pulse-direction output, and selectable direction points.
Output Specification — PWM Parameters
Output Circuits4
Output Frequency10Hz~20KHz
Period50~100000us
Duty Cycle0.00 ~ 1.00 (two decimal places)
Function Execution ResultDuty Cycle        Result
  1          Duty cycle is 100%, continuous ON output
  0          Duty cycle is 0%, continuous OFF output
Communication Interface — Ethernet
Number of Interfaces2
Baud Rate100/1000Mbps auto-negotiation
Supported Protocol TypesSupports visualization WebVisu
Supports MODBUS TCP master/slave functionality
Supports Codesys tag-based communication
Supports Socket functionality
Supports PROFINET (PN) slave functionality
Supports CTNET protocol
Supports OPC UA slave*Note: Contact the manufacturer separately to enable this protocol
Supports EtherNet/IP master*Note: Contact the manufacturer separately to enable this protocol
Number of Supported ProtocolsModbus TCP/IP master-slave protocol: Supports data reading from up to 32 slave stations
EtherNet/IP protocol: Supports up to 253 stations*Note: Contact the manufacturer separately to enable this protocol
Socket: Supports up to 1000 connections
CTNET: Supports up to 64 slave stations
Size of Data Transmission per ProtocolModbus TCP/IP: Only one data transmission at a time, up to 240 bytes
EtherNet/IP: No data limit*Note: Contact the manufacturer separately to enable this protocol
Socket: No data limit
CTNET: Master station supports reading up to 64K slave data; slave station supports transparent transmission of up to 10K data
Local Monitoring/Local Programming FunctionSupported
Remote Monitoring/Remote Programming FunctionSupported* *This function requires contacting the manufacturer separately
Maximum Cable Length per Segment100m
IsolationCommunication port isolation
Software FunctionDual Ethernet ports support switch function
Communication Interface——EtherCAT
Number of interfaces1
Baud rate100Mbps
Maximum cable length per segment100m
Number of slave stations72
Supported functionsSupports distributed clock configuration
Supports startup parameter configuration
Supports PDO parameter configuration and mapping
Supports bus cycle configuration
Supports vendor ID and product ID check at startup
Supports slave station scanning
Supports slave station masking
Communication Interface——RS485
Number of interfaces Up to 5 channels (1 channel on main unit, expandable to 2 via extension cards)
PPI baud rate9.6Kbps、19.2Kbps、187.5Kbps
Free port baud rate1.2Kbps ~ 115.2Kbps, built-in Modbus RTU master/slave function
Maximum cable length per segment<100m at 115.2Kbps
<1000m at 19.2Kbps
IsolationCommunication port isolation
Number of slave stations per channel32 stations per segment
Hardware Interface——Type‑C
Supported functionsUpdate program and firmware via USB flash drive
Direct program download/update via Type-C
Supports power supply via Type-C interface
Hardware Interface —— Expansion Slot
CTSI-485/485/RTC-E1Two such modules can be expanded, slots are interchangeable
Each slot can expand 2 RS485 interfaces, supports free protocols and Modbus RTU master/slave function
CTSI-485/CAN-E1One such module can be expanded, slots are interchangeable
Expands 1 RS485 interface, supports free protocols and Modbus RTU master/slave function
Expands 1 CAN interface, supports Canopen master protocol, expandable to 32 slave stations; supports CANFree protocol
CTSI-AMS03-E2One such module can be expanded, slots are interchangeable
Each slot can expand 2AI*12bit, 1AQ*12bit
CTSI-RTC-E1One such module can be expanded, slots are interchangeable
Expands RTC clock, clock accuracy: ±120 seconds/month
CTSI-4G-E1One such module can be expanded, slots are interchangeable
Expands a slot supporting 4G cards, connecting a 4G SIM card enables 4G wireless communication
LED Indicator Characteristics
PWR IndicatorGreenON = 24VDC power supply normal, OFF = No 24VDC power supply
SF IndicatorRedON = System fault, OFF = No fault
BF IndicatorRedON = Bus fault, OFF = No fault
RMC IndicatorGreenReserved
RUN Dual-color IndicatorGreenON = System running, OFF = System stopped
YellowON = System stopped, OFF = System running
RJ45 IndicatorGreenON = Connected, OFF = Not connected
YellowON = 1000Mbps,OFF = 100Mbps
Digital Input IndicatorGreenON = Signal input detected, OFF = No signal input
Digital Output IndicatorGreenON = Signal output detected, OFF = No signal output
PB IndicatorGreenON = Expansion bus power supply normal, OFF = No expansion bus power supply
Power-on Indicator StatusBefore the CPU starts running: The PWR light is on, and all other lights (SF, BF, RMC, RUN) are off.
After the CPU starts running: The PWR light is on, the RUN green light is on, and all other lights (SF, BF, RMC, RUN yellow) are off.


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