Configuring Siemens SIMATIC OP7 with ProTool: Cable & Setup Guide

1. Overview

The SIMATIC OP7 (order number 6AV3607-1JC20-0AX1) is a compact text-display operator panel from the Siemens SIMATIC HMI family, released in the late 1990s alongside the OP3, OP5, OP15 and OP17 series. Designed as a low-cost status/alarm/parameter terminal for SIMATIC S5, S7-200 and S7-300 lines, the OP7 fits cabinets where a graphical HMI is unnecessary but operator entry plus diagnostics are required. Configuration is performed with Siemens ProTool (the reference build is ProTool V6.0 with Service Pack 2), which compiles a binary project image transferred to the panel over an RS-232 TTY (20 mA current loop) or MPI link.

This reference covers the canonical install path for the OP7 on a modern Windows engineering workstation: where to obtain ProTool, the PC-to-panel cable, the parameter set that drives a successful transfer, and the field verification steps that confirm a working commission. A troubleshooting matrix and a migration pathway to WinCC flexible / TIA Portal are appended for legacy installations.

2. Hardware Identification and Variant Ambiguity

Siemens released the OP7 under several order suffixes; the two relevant to the OP family are -0AX0 and -0AX1. They differ in on-board interfaces and are easy to confuse once a panel has been removed from service.

2.1 Suffix identification procedure

1. Isolate and open the rear cover of the OP7 (24 V isolated first).
2. Locate the CE/UL plate; the suffix appears after the dash on the second line (e.g., 6AV3607-1JC20-0AX1).
3. Cross-check against Table 2; commit the resulting interface set before proceeding to cabling.

3. Configuration Software — ProTool Versions

ProTool is the legacy configuration toolkit for the SIMATIC OP/TP/MP panel series before WinCC flexible took over. The OP7 family is supported from ProTool V5.2 SP2 through V6.2 SP3. The version most often quoted as a reference build is ProTool V6.0 SP2 (internal build 6.0.0.4).

ProTool is archived at the official Siemens Industry Online Support entry 6AV6581-3BX06-0DX0 (ProTool V6.0). Authentication requires a Siemens Industry Online Support account. Legacy installations are also present on the SIMATIC Documentation & Software DVD set (order code 6ES7 998-8XA01-8YE0). The reference manual for SIMATIC 500/505 tooling that references ProTool is published at Siemens entry ID 29034071.

ProTool installs the Device Catalogue, which lists every supported panel model. If the OP7 entry disappears, the catalog file OP.cat has been overwritten by a later ProTool version — reinstall the SP2 patch or restore OP.cat from the original media.

3.1 Project sizing for OP7

4. PC ↔ OP7 Cabling and Converter Wiring

The OP7 was engineered before USB was standard on industrial PCs; the panel exposes a TTY (20 mA current loop) interface. Connecting a modern engineering workstation requires an RS-232 ↔ TTY converter, since a passive null-modem cable cannot drive a current-loop receiver.

4.1 Internal wiring of the PC-TTY converter

The 6ES7 901-3CB30-0XA0 converter performs the level transition in a single box. The relevant wiring scheme is summarised below.

The current loop sources 20 mA from pin 1 (T+) returning on pin 2 (T−). Reverse connection results in the panel reporting No PG/PC indefinitely. The round connector is keyed to prevent mirror insertion; an older alternative used a 4-pin Siemens TTY cable, order code 6XV1 440-1KH12.

5. Installing ProTool on a Modern Windows PC

1. Back up the system prior to installing a 16-bit INF-companion ProTool driver if the installer prompts.
2. Disable UAC or run the installer as Administrator (right-click → Run as administrator).
3. Mount the SIMATIC Documentation & Software DVD (or the ProTool V6.0 ISO) and execute Setup.exe.
4. Select ProTool Configuration and the matching Service Pack; tick Install Op-Catalog OPC.
5. Insert the USB CodeMeter dongle when prompted (or plug the legacy parallel dongle into LPT1).
6. Reboot. Confirm the ProTool menu group appears under Start → SIMATIC → ProTool.
7. Open ProTool and select File → New. The OP7 entry should be present in the device list.

6. Building the OP7 Project

1. New project: Open ProTool, File → New. In the device-selection dialog select OP7 under SIMATIC HMI → Text Devices.
2. Project path: Use no spaces and ≤ 8 characters in the filename to avoid issues when cross-importing to STEP 5 / STEP 7 archives.
3. PLC selection: Pick the connected controller protocol and configure the COM port + baud rate:
   • AS511 over TTY: 9600 bit/s, Even parity, 8 data, 1 stop.
   • PPI to S7-200: 9600 bit/s, OP7 network address 1.
   • MPI to S7-300/400 (0AX1): 187.5 kbit/s, OP7 address 1.
4. Area pointers: ProTool will request three area pointers. The defaults are:
   • Status byte: MW 0
   • Control byte: MW 2
   • Date/time: DB10 word (or set to none if unused)
5. Tags: Use the Tag Editor to point at a SIMATIC S7-300 data block (e.g., DB100). S5-95U/F projects reference flag byte, data word, or DB/DX parameters.
6. Screens: Create up to 12 screens. Each screen defines which tags to display, alarm acknowledgement, and the soft-key actions.
7. Alarms: Define discrete alarms (bit-triggered) and analog alarms (limit-based) referencing the same tags.
8. Recipes: Optional. Map the recipe to a 16-entry array, often stored in DB50.
9. Compile: Project → Compile. ProTool produces a *.pnz file ready for transfer.

6.1 Tag definition example

Tag Name       : "M1_Speed"
PLC            : SIMATIC S7-300
Data area       : Data Block
DB number       : 100
Byte.Offset     : 0.0
Length          : 2 bytes
Type            : INT (signed)
Display         : Numeric, 5 digits, " rpm"
Limit 0         : 0      (yellow)
Limit 1         : 1500   (red)
Sampling cycle  : 1 s
Acquisition     : Continuous

6.2 Alarm definition (motor overload)

Alarm number    : 27
Class           : Fault
Trigger tag     : "M1_Temp"
Trigger logic   : > 85 °C, sustained 3 s
Acknowledgement : Operator acknowledged
Display screen  : Screen_2

6.3 Soft-key action (start command)

F-key           : F1 (soft-key "Run")
Action          : Set Bit
PLC area        : Output (PAB)
Address         : A 8.0
Bit behaviour   : Set to 1 on key-press; reset on key-release

7. Project Transfer Procedure (TTY)

1. Connect the PC-TTY converter to the OP7 round (TTY) port; observe the converter LEDs transitioning to Ready.
2. Power on the OP7. The panel displays a startup message followed by the home screen or the boot menu. When a project is missing or corrupted, the boot menu offers Transfer mode automatically.
3. Press F2 + Insert (or, on -0AX1 suffixes, set the panel-side rotary switch to Download).
4. In ProTool open File → Download → Settings. Configure the PC serial channel:
   • PC interface: COM1 (or the COMx mapped to USB-RS232 if used)
   • Baud rate: 9600 bit/s (TTY) or 187500 bit/s (MPI)
   • Handshake: RTS/CTS
   • Parity: Even
   • Data bits: 8
   • Stop bits: 1
5. Click OK. Then File → Download → Start to send the compiled *.pnz.
6. The OP7 progress indicator climbs to 100 %. The OP7 reboots automatically into run mode with the newly loaded project.

8. MPI Network Setup (0AX1 Variant)

When the panel carries the -0AX1 hardware suffix and exposes a 9-pin sub-D MPI port, the OP7 can join an MPI bus at 187.5 kbit/s. The MPI route is preferred for plants with a single PC engineer working on multiple panels.

9. Operator Acceptance Test (Commissioning Checklist)

1. After download the OP7 displays the home screen; verify each configured tag shows the correct value read from the PLC.
2. Force a bit in the connected PLC using STEP 7 or a programmer; verify the OP7 redraws the affected screen within one update cycle (typically ≤ 1 s).
3. Push the operator past a configured limit value (e.g., M1_Speed > 1500 rpm); confirm the analog alarm fires and is recorded in the message list.
4. Press each soft-key in turn; confirm the configured bit toggle, screen change, or recipe load.
5. Cycle panel power; the project, clock, and recipe data must survive. If any data resets to zero, replace the CR2032 battery (panel-side compartment).
6. Run for 30 minutes without operator interaction; the OP7 should not enter a fault state nor require a watchdog reset.
7. Capture the project file *.pnz to the maintenance folder and label the project archive per the plant's engineering convention.

9.1 Battery replacement

1. Remove 24 V from the OP7.
2. Loosen the rear battery compartment cover.
3. Replace the CR2032 cell observing polarity (+/−).
4. Re-apply 24 V and re-set the real-time clock via the OP7 Setup menu.

10. Troubleshooting Matrix

11. Migration to OP73 / WinCC flexible

The OP7 family has been replaced on Siemens price lists by the OP73 (same text-display form factor) and the KTP400 Comfort for graphical applications. Plants that already own an OP7 and wish to preserve the engineering investment can migrate an existing project using WinCC flexible.

1. Install WinCC flexible 2005 SP1 or later.
2. Open the WinCC flexible project wizard; select Migrate.
3. Choose the original *.pnz as the source file.
4. Select the target device OP73 mono; the wizard preserves tags, alarms, and screens within OP73 capacity.
5. Re-check the area pointers — WinCC flexible defaults to DB pointers rather than MW.
6. Compile and transfer to OP73.

12. Frequently Asked Questions