Siemens SIMATIC C7-623/C7-624 Control System

Siemens SIMATIC C7-623/C7-624 Control System

Product Overview

Hardware differences

C7-623: 4 soft buttons F1-F4; Display screen 4 x 20 characters;

C7-624: 8 soft keys F1-F8; The display screen supports more character modes.

Internal architecture: The device contains C7-CPU (PLC controller) and C7-OP (operation panel), which communicate through an internal MPI bus and occupy independent MPI node addresses.

Core Competency

Support STL and LAD ladder diagram programming, run S7-300 user program;

Comes with integrated digital, analog, and universal inputs;

Develop panel human-machine interface using ProTool/ProTool Lite;

Can be connected to an external printer to output alarm messages;

Extend the standard S7-300 signal module SM, functional module FM, and communication processor CP through the IM361 interface.

Required software tools: STEP7 (PLC programming), ProTool/Lite (HMI configuration); PG/PC programmer, MPI communication cable.

External components: IM361 expansion rack, various modules of S7-300, other S7-300/400 CPUs, OP operation panel, RS485 repeater, printer.

Mechanical installation

Installation form: Embedded installation of control cabinet doors; The opening size DIN43700:230.5 × 158.5 mm; the panel thickness allows 1-4 mm; equipped with sealing gaskets to ensure protection.

Heat dissipation gap: A gap of 50mm should be reserved around the device, and 70mm should be left and right to avoid direct sunlight.

Accessories List (Comes with Factory): Equipment Body, Button Label Strip, Backup Lithium Battery, Grounding Bar, Shielding Clip, Seals, 4 Fixed Supports.

Label strip: It can replace blank label strips to achieve on-site customization of key text, and must be replaced after the device is removed.

Connector coding error prevention: Use coding keys to prevent I/O plugs from being inserted in the wrong position.

Expansion rack: This machine integrates IM360 and uses 368 series IM cables to connect external IM361, expanding the S7-300 rack.

Clock system: equipped with a master clock, relying on backup batteries to maintain a power-off clock; The CPU has a built-in running hour counter, which can be read and written through SFC system functions.

LED status indicator: hardware failure, battery failure, 5V power supply, RUN/STOP and other status indicators.

Device initialization clearing operation

Clear OP panel: Power off, press and hold a specific button to power on again, and clear all HMI configurations;

Clear CPU (MRES memory reset): Enter CPU mode from the panel system menu and perform MRES reset; Clear working memory and reload user programs from Flash.

Electrical installation and EMC anti-interference

Power supply: External 24   VDC SELV safety ultra-low voltage power supply; The functional grounding terminal requires a minimum of 4mm ² cable to be connected to the protective ground of the cabinet.

All I/O interfaces

Digital input DI, digital output DO;

Analog input AI (4 channels), analog output AO (1 channel);

4-channel universal input;

V. 24 serial port (connected to printer);

MPI multi node communication port;

IM extension interface.

EMC anti-interference wiring rules

All analog and digital signals use shielded twisted pair cables;

The shielding layer should be grounded at both ends first; Change to single ended grounding when there is a ground potential difference;

The signal line and power cable are laid separately, with a spacing of ≥ 50cm;

The interference devices inside the cabinet are arranged at the bottom of the cabinet, and the grounding bar is close to the cable entrance; Multiple short-circuit protection grounding for cabinet doors and metal components.

Shielding wiring method: Use the device's built-in grounding bar and shielding clip to crimp the cable shield onto the shielding clip.

I/O interface hardware parameters

1) Digital quantity DI/DO

Digital input DI: 16 channels, 24VDC, group isolation; Can be connected to a switch or a two-wire proximity switch.

Digital output DO: 16 channels, 24VDC; Single channel 0.5A; maximum 4A per group (20 ℃), high temperature drops to 2A; electrical isolation; At the moment of power on, a brief pulse will be output; Support solenoid valves and DC contactors; Internal voltage limiting protection for inductive loads; Equipped with short-circuit electronic protection.

The panel comes with system functions, allowing for direct viewing of DI/DO binary status on the screen without the need for a programmer.

2) Analog AI/AO

Analog input AI: 4 channels, 12 bits including sign bit; Isolation; Supports -10V voltage, ± 20mA, 4-20mA; 4-20mA mode supports disconnection diagnosis; Conversion time 2.5ms, basic error ± 1% of full scale.

Current measurement requires short circuiting the AI-U and AI-I pins. Supports isolated/non isolated transmitter wiring, with a complete wiring schematic provided in the documentation.

Analog output AO: 1 channel, 12 bits with symbols; Configurable voltage output (± 10V) or current output (± 20mA/4-20mA); Electrical isolation; Perform group fault diagnosis.

3) Universal Input

There are a total of 4 DI-X1~X4 channels, with software switchable functions: normal digital input, interrupt input, counter, frequency measurement, and cycle measurement; X3 supports frequency/cycle acquisition; The counting range is 0-16777215.

MPI Multipoint Interface Network Configuration

C7 baud rate is fixed at 187.5 kbit/s; The C7 device occupies two MPI addresses internally: OP defaults to 1, CPU defaults to 2, and programmer PG defaults to 0.

Network rules

The MPI addresses of all nodes in the network cannot be duplicated; The parameter setting for the "highest MPI address" across the entire network must be consistent;

The maximum number of nodes in a single RS-485 network segment is 32; Expanding beyond the use of RS485 repeaters; Up to 9 repeaters can be connected in series;

The bus connectors at both ends of the physical bus must have terminal resistors open; The node that opens the terminal resistor must remain powered on;

Maintaining PG can access the network through spur lines, but the length of the spur lines is limited.

Hardware components: PROFIBUS shielded bus cable, two types of 9-Sub bus connectors (with/without PG programming port), RS-485 repeater; The document provides detailed illustrations of bus connector stripping, wiring, and vertical/diagonal outlet settings.

CPU-CPU communication: C7-CPU supports up to 4 global data GD communication loops and exchanges global data with other S7-300/C7s.

PG/Programmer Connection

Two access methods:

Fixed access: PG is directly connected to the MPI bus as a network node;

Maintain temporary access: connect to a bus connector with a programming port through a branch line;

When the network address is unknown on site, PG sets MPI address 0 and the highest address to 126, and scans the network to identify all sites.

Maintenance chapter

Backup lithium battery replacement: The battery must be replaced when the device is powered on, otherwise RAM data will be lost; Suggest annual replacement; Lithium batteries belong to Class 9 dangerous goods and are prohibited from charging, squeezing, drilling, and high temperature; Storage for up to 5 years.

Whole machine replacement: Before replacing C7, ensure that the program and HMI project have been backed up in PG, and download the project after the new device performs a memory reset.

General Technical Specifications

environmental conditions

Working temperature: 0-50 ℃ for vertical installation; 45 ° oblique installation 0-45 ℃;

Storage and transportation -20~+70 ℃; Humidity 5-95% without condensation;

Vibration and impact meet the DIN IEC68-2 series standards;

Electromagnetic compatibility: ESD static electricity, pulse group, surge, RF radiation immunity indicators; Meet CE requirements; have UL, CSA, and FM certifications (Class I Div.2 hazardous locations).

Mandatory requirement for power supply: All 24V power supplies must use SELV safety ultra-low voltage.

Mechanical instruction prompt: The C7 controller does not belong to the mechanical equipment itself, and the equipment manufacturer needs to comply with the mechanical instructions of the entire machine according to EN60204-1.

ESD electrostatic protection specification

Explain the characteristics of ESD damage to electrostatic sensitive devices: many damages do not immediately manifest and fail after long-term operation;

Operation measures: Release static electricity in front of personnel contact devices, use grounding wristbands and anti-static workbenches; Do not touch the pins; The device is stored in conductive anti-static packaging; The measuring tool must be grounded.