Resolving HW Config Error 1230:2001 Object Cannot Be Inserted on CP 443-5 Master Systems

In STEP 7 Hardware Configuration (PCS 7 V8.0 / STEP 7 V5.5 SP4), attempting to insert PROFIBUS DP slaves—such as SIMOCODE-DP or third-party GSD devices—onto a CP 443-5 Extended (6GK7 443-5DX04-0XE0) master system fails with error 1230:2001 'The object cannot be inserted' when the communication processor operating mode is misconfigured or when the hardware catalog index database is corrupted. Resolving the error requires configuring the CP as an active DP Master and rebuilding the catalog index.

Role of CP 443-5 Extended in SIMATIC S7-400 PROFIBUS Topologies

In SIMATIC S7-400 automation stations, the CP 443-5 Extended (6GK7 443-5DX04-0XE0) communication processor expands fieldbus connectivity beyond the CPU's integrated DP interfaces:
* It offloads communication processing from the controller CPU, supporting up to 124 PROFIBUS DP slaves at baud rates from 9.6 kbps to 12 Mbps.
* It operates as a class-1 DP master executing cyclical data exchange (DP-V0) and acyclic parameter records (DP-V1).
* When designing the hardware rack in STEP 7 HW Config, the engineer creates a dedicated DP Master System attached to the CP interface, allowing ET 200M remote I/O, SIMOCODE motor controllers, and intelligent third-party transmitters to be placed on the bus.

Analysis of Error 1230:2001: The Object Cannot Be Inserted

Engineers encounter a specific obstruction when building the network:
* Inserting a standard Siemens ET 200M station onto the CP 443-5 master system succeeds.
* However, dragging and dropping a SIMOCODE-DP unit or an imported third-party GSD device onto the same bus line immediately aborts with dialog:

Error (1230:2001) The object cannot be inserted.
* Because the failure affects both vendor GSD files and Siemens catalog components, the issue is not caused by a defective GSD syntax, but by database or operating mode constraints within STEP 7.

Root Cause 1: CP 443-5 Operating Mode and Bus Parameter Configuration

A CP 443-5 Extended can operate in several distinct communication roles. If the module properties are misconfigured:
1. Double-click the CP 443-5 Extended in the S7-400 rack in HW Config.
2. Select the Operating Mode tab.
3. Verify that the selected mode is explicitly set to DP Master.
* If the mode is left at No DP or configured as DP Slave, STEP 7 blocks attaching slave devices and generates error 1230:2001.
4. Select the PROFIBUS interface properties:
* Click Properties -> Network Settings.
* Verify that the bus profile is set to DP (not Standard or Universal).
* Ensure that DP-V1 mode is enabled if attaching modern DP-V1 slaves like SIMOCODE pro.

Root Cause 2: Hardware Catalog Index (.idx) Database Corruption and Repair

If the operating mode is correct but error 1230:2001 persists across multiple slave types, the STEP 7 Hardware Catalog binary index cache is corrupted:
1. Close SIMATIC Manager and all open STEP 7 applications.
2. Open Windows File Explorer and navigate to the STEP 7 installation data folder:
C:/Program Files (x86)/Siemens/Step7/S7DATA/GSD/.
3. Locate and delete all cached index files matching:
* *.idx (e.g., hwcnff.idx, hwrules.idx).
4. Re-open SIMATIC Manager and launch HW Config.
5. Select Options -> Update Catalog. STEP 7 automatically scans all installed GSD files and system XML descriptions, regenerating clean index tables.
6. Drag the SIMOCODE-DP or GSD slave onto the CP 443-5 master line: the device inserts cleanly.

Verification

In HW Config, verify that the SIMOCODE-DP and GSD field devices appear on the CP 443-5 bus line with valid slave addresses (e.g., DP address 3, 4, 5).
Configure I/O module slots within the slave properties.
Execute Station -> Save and Compile: confirm that the compilation completes with zero errors and generates clean System Data Blocks (SDBs).
Perform a consistency check via Station -> Consistency Check: verify that all subnet parameters and addresses resolve properly.

Limitations and Operational Precautions

Downloading a recompiled hardware configuration containing new DP master systems requires downloading System Data Blocks, which requires placing the CPU in STOP mode.
When installing third-party GSD files, always ensure associated device bitmap icons (.bmp) are placed in the S7DATA/NSBM/ folder to prevent catalog display faults.
Verify total DP slave count on the CP 443-5 does not exceed 124 slaves or 240 bytes of I/O data per slave.

Engineer FAQ

What does STEP 7 error 1230:2001 indicate during hardware configuration?
It indicates that the selected hardware catalog element is incompatible with the target master bus line or the catalog index is corrupted.
What operating mode must be selected on CP 443-5 Extended to attach slaves?
The operating mode must be set to DP Master under module properties.
Why did ET 200M insert successfully while SIMOCODE-DP failed?
ET 200M uses internal STEP 7 system rules that can bypass certain catalog index corruptions that block standard GSD/DP-V1 slaves.
Where are the temporary hardware catalog index files located?
In C:/Program Files (x86)/Siemens/Step7/S7DATA/GSD/ with file extension .idx.
Does deleting .idx files delete installed GSD files?
No, .idx files are temporary binary caches; deleting them forces STEP 7 to rebuild index tables from the raw .gsd files.
How do I update the hardware catalog after deleting index files?
Open HW Config and select Options -> Update Catalog.
What bus profile is required for CP 443-5 DP master communication?
The DP profile configured under PROFIBUS Network Settings.
Can a CP 443-5 Extended operate as both a DP master and an S7 communication partner?
Yes, CP 443-5 Extended supports simultaneous DP-V0/DP-V1 master communication and S7 routing / S7 connections.
What is the maximum number of slaves supported on a single CP 443-5 Extended?
Up to 124 physical PROFIBUS DP slaves.
Does error 1230:2001 occur in TIA Portal?
This specific error code belongs to STEP 7 V5.x / PCS 7; TIA Portal uses different internal hardware compiler error codes.

Technical References

SIMATIC NET S7-400 CP 443-5 Extended Manual (6GK7443-5DX04-0XE0)
SIMATIC STEP 7 V5.5 Hardware Configuration Manual
Siemens Industry Online Support Entry: Troubleshooting HW Config Error 1230:2001 (Entry ID 299442)
SIMOCODE pro PROFIBUS System Manual