Siemens 6ES7626-1DG04-0AE3 SIMATIC C7-626

Name: Siemens 6ES7626-1DG04-0AE3 SIMATIC C7-626
Brand: Siemens
SKU: 6ES7626-1DG04-0AE3
Availability: InStock

Price range: € 2.047,00 through € 3.500,00

Condition

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SKU: 6ES7626-1DG04-0AE3 Category: HMI & Display Brand: Siemens

Description
Additional information

The Siemens SIMATIC C7-626, part number 6ES7626-1DG04-0AE3, is a compact combined controller and operator panel unit belonging to the SIMATIC C7 product family. It integrates a programmable logic controller (PLC) based on the S7-300 CPU architecture with an operator panel (OP) into a single housing, eliminating the need for separate HMI and controller hardware. This all-in-one design is intended for machine-level automation tasks where space and wiring economy are priorities.

The C7-626 features a built-in monochrome STN LCD display with touch or key-based operation depending on the variant, and supports MPI (Multi-Point Interface) for communication with other SIMATIC devices and programming tools. It includes integrated digital I/O points directly on the unit, onboard program and data memory compatible with S7-300 programming conventions, and supports STEP 7 programming software for configuration and logic development. The unit operates on 24 V DC supply voltage and is designed to meet industrial environmental requirements including relevant CE and UL certifications.

The SIMATIC C7-626 is widely used in standalone machine automation, packaging equipment, material handling systems, and small to mid-scale production lines where a compact footprint is essential. Its integration of control and visualization in a single panel-mount unit makes it suitable for OEM machine builders seeking to reduce cabinet space and simplify system architecture. Industries such as food and beverage, automotive assembly, and general manufacturing commonly deploy this unit for local machine control and operator interaction.

Technical Specifications

Series/Product Family	SIMATIC C7
Display Type	Monochrome STN LCD
Input/Operating Voltage	24 V DC
Communication Interface	MPI (Multi-Point Interface)
Integrated I/O	Digital inputs and outputs onboard
Programming Software	STEP 7
CPU Base	S7-300 compatible
Mounting	Panel mounting
Operating Temperature	0 °C to +55 °C
Storage Temperature	-20 °C to +70 °C
Relative Humidity	10 % to 90 % (non-condensing)
IP Rating (Front)	IP65
Certifications	CE, UL

Common Error Codes & System Events

Event ID: 40000: Loss of communication on MPI interface. The C7 unit has lost connection to a configured MPI partner device.
Check MPI cable connections and termination resistors. Verify MPI address settings in STEP 7 configuration match the physical device settings.
Event ID: 10000: PLC CPU has transitioned to STOP mode due to a programming error or configuration fault.
Connect STEP 7 programming tool via MPI, read the diagnostic buffer, identify the cause of the STOP, correct the program or hardware configuration, and restart the CPU.
Event ID: 10001: Memory card error or program memory fault detected on the CPU.
Check the memory card seating. Replace the memory card if corrupted. Re-download the STEP 7 program to the unit.
Event ID: 40010: Tag update error: a configured process variable cannot be read from the PLC data area.
Verify the tag address configured in the HMI project matches the actual PLC data block or memory area. Re-download the HMI project after correction.
Event ID: 50000: Project download error. The HMI configuration could not be fully transferred to the C7 panel.
Check the MPI connection between the programming PC and the C7 unit. Ensure sufficient free memory on the device and retry the download using ProTool or STEP 7.
Event ID: 20000: Operating system or firmware fault detected. Internal watchdog has triggered.
Perform a power cycle of the unit. If the fault persists, check firmware version compatibility and consider a firmware update or unit replacement.
Event ID: 60000: I/O access error: the CPU cannot access one or more configured I/O modules or onboard I/O points.
Check wiring to I/O terminals. Verify I/O configuration in STEP 7 hardware configuration matches the physical setup. Check for blown fuses or damaged wiring.

Frequently Asked Questions

What programming software is required for the SIMATIC C7-626?

The C7-626 is programmed using Siemens STEP 7 for the PLC logic and ProTool for the HMI visualization configuration. Both tools communicate with the unit via the MPI interface.

What communication interfaces does the 6ES7626-1DG04-0AE3 support?

The unit supports MPI (Multi-Point Interface), which allows connection to STEP 7 programming tools, other SIMATIC S7 controllers, and additional HMI devices within a SIMATIC network.

Can the SIMATIC C7-626 be used as a standalone controller without an external PLC?

Yes, the C7-626 integrates an S7-300 compatible CPU directly into the unit, allowing it to execute PLC programs independently without requiring a separate controller.

What is the supply voltage for the 6ES7626-1DG04-0AE3?

The unit operates on a 24 V DC supply voltage, which must be provided externally and connected to the designated power terminals on the unit.

Is the front panel of the C7-626 rated for wash-down or dusty environments?

The front panel of the C7-626 carries an IP65 protection rating, making it suitable for environments where dust ingress and water jets may be present, though the rear of the unit requires a sealed enclosure.

Troubleshooting

Display remains blank after power is applied

Measure 24 V DC at the power supply terminals of the C7 unit. Check internal fuse if accessible. Verify the power supply can deliver sufficient current for the unit.

Ensure the 24 V DC supply is stable and within tolerance. Replace the supply fuse if blown. If the display backlight has failed, the unit may require repair or backlight replacement by a qualified technician.

CPU is in STOP mode and will not transition to RUN

Connect a STEP 7 programming terminal via MPI and read the CPU diagnostic buffer to identify the specific fault causing the STOP condition.

Correct the identified fault in the STEP 7 program or hardware configuration, clear the diagnostic buffer, and perform a CPU restart from the STEP 7 online interface or using the mode selector if present.

MPI communication cannot be established between the C7 and the programming PC

Verify the MPI adapter (PC Adapter or CP card) is correctly configured with the same MPI baud rate as the C7 unit. Check cable integrity and termination resistors at both ends of the MPI segment.

Set the MPI baud rate consistently across all devices on the segment. Ensure only the two physical end devices have termination resistors active. Replace the MPI cable if continuity tests fail.

HMI tags display question marks or show no value on screen

Check the tag configuration in the ProTool project to confirm the PLC address areas referenced by the HMI tags exist in the STEP 7 program and are accessible.

Correct any mismatched tag addresses in the ProTool project, re-compile the HMI project, and re-download it to the C7 unit via MPI. Ensure the CPU is in RUN mode during operation.

Onboard digital inputs are not responding to field signals

Measure the input signal voltage at the I/O terminals with a multimeter. Verify the signal voltage meets the 24 V DC input threshold required by the unit's digital inputs.

Ensure field devices are supplying the correct 24 V DC signal level. Check wiring continuity from the field device to the C7 terminals. Inspect for damaged wiring or loose terminal connections.

Condition	Repair, Used, Refurbished, New in box (sealed)