OMRON SYSMAC CS Series CS1G/H-CPU  H Programmable Controller

The CS1-H CPU unit has high system scalability and can build control systems ranging from small to medium to large.

Rack and Expansion:

CPU rack: composed of CPU unit, power supply unit, and CPU backplane.

Expansion rack: Up to 7 expansion racks (CS series expansion rack or C200H expansion I/O rack) can be connected, and the total cable length must not exceed 12 meters. The CS series long-distance expansion rack can be configured into two series, each with a maximum length of 50 meters and a total length of 100 meters.

SYSMAC BUS Slave Rack: Used to build remote I/O systems, each master unit can connect up to 8 slave racks.

Unit type and I/O allocation:

Basic I/O units: including input, output, and hybrid I/O units of CS series and C200H series. Its I/O memory (CIO 0000- CIO 0319) is allocated in the order of its installation position (slot) on the rack. Users can set the first address of each rack or slot through CX Programmer to achieve flexible I/O address planning.

Special I/O units: including specialized functional units such as analog, temperature control, position control, and high-speed counting. Each unit is assigned 10 words in the CIO 2000-CIO 2959 area based on its unit number (0-95), and 100 words in the DM area (D20000-D29599) for parameter settings.

CPU bus unit: including network communication units such as Controller Link, Ethernet, DeviceNet, etc. Each unit is assigned 25 words in the CIO 1500-CIO 1899 area based on its unit number (0-15), and 100 words for parameter settings in the DM area (D30000-D31599).

4. Memory architecture and data processing

The memory of CS1-H CPU unit is divided into I/O storage area and parameter area, with clear structure and clear functions.

I/O storage area:

CIO area: the core area used for exchanging data with various units, and unused parts can be used as internal workstations.

Workspace (W): dedicated bits and words for internal programming, not assigned to external I/O, and is the preferred workspace for programming.

Retention zone (H): Content retention during power failure or mode switching, commonly used to store critical states or set values.

Auxiliary area (A): Contains a large number of read-only and read-write system flags and control bits, such as cycle time, error flags, clock data, operation start/end time, etc. For example, A000 is a read-only free running timer that increments every 10ms.

Data Memory (DM): A general-purpose data area for reading and writing 16 bit data in word units, with power-off holding.

Extended Data Storage (EM): Similar in function to DM, but divided into multiple 32K word "banks", with a maximum of 13 banks (0 to C). Part of the EM area can be configured as file memory.

Index registers (IR0-IR15): 32-bit registers used to store PLC memory addresses and achieve indirect addressing. Supports automatic addition, subtraction, and offset, making it a powerful tool for handling table data and loops.

Data Register (DR0-DR15): A 16 bit register used to provide offset for index registers.

Parameter area:

PLC settings: including core operating parameters such as CPU unit startup, communication ports, cycle time, interrupt tasks, etc.

Register I/O table: records the actual installed unit model and location, and compares it with the actual configuration when the CPU starts up.

Routing table: used to define the transmission path of FINS commands in a multi-layer network.

5. Core functions and programming features

Task programming: The program can be divided into up to 32 loop tasks and 256 interrupt tasks (power off interrupt, scheduled interrupt, I/O interrupt, external interrupt). Task Control Instructions (TKON/TKOF) can dynamically enable or disable loop tasks, achieving program modularization and optimizing loop time.

Function block: Supports ladder diagrams and structured text (ST), allowing for code encapsulation and reuse. The impact of instantiation on loop time can be calculated as: startup time+I/O parameter transfer processing time+execution time of defined instructions.

Instruction set: It has about 400 instructions, including text string processing, table data processing, floating-point operations, high-speed counters, positioning control, and other advanced instructions.

Communication function:

Built in ports: one peripheral port and one RS-232C port, supporting Host Link, NT Link (1: N), no protocol, serial gateway (CompoWay/F) and other modes.

Protocol macro: Through the serial communication board/unit, users can define the protocol for communication with third-party serial devices, and execute PMCR instructions to complete data exchange.

Network communication: FINS message communication, data linking, and remote I/O control are achieved through network units such as Ethernet, Controller Link, and DeviceNet.

6. Operation and maintenance

DIP switch: There is an 8-bit DIP switch under the front cover of the CPU unit, which is used to set write protection, automatic program transfer at startup, peripheral port/RS232C communication mode, etc.

PLC settings: Configure through CX Programmer or programming console, including startup mode, I/O response time, watchdog timer, fixed cycle time, serial port parameters, etc.