# Modbus (131)

The connection between Controller and PLC via ModbusTCP is disturbed.

The cause of the error can be detailed by the Sub-ID:

### 0 - Cannot create Modbus Socket

When initializing the Ethernet-socket for modbusTCP connection can not be created. Check Ethernet-connection.

### 1 - Cannot bind Port

When initializing the Ethernet-port for modbusTCP connection can not be reserved. Check Ethernet-connection.

### 2 - Cannot Init Modbus: Listen failed

When initializing the Ethernet-port for modbusTCP connection can not be opened. Check Ethernet-connection.

### 3 - Cannot Establish Connection: Out of Mem

A connection request via modbusTCP port may not be edited due to insufficient memory. Please contact the development department.

### 4 - Send Queue full

Too Many packets are waiting for sending via network interface. Check Ethernet-connection.

### 5 - Timeout Receive from SPS

No packet from PLC has been received within set time in parameter 3001. Check Ethernet-connection.

### 6 - Queue: try to delete non existent element

In the transmit queue an element to be deleted does not exist.

### 7 - Queue: try to delete element with childs

In the transmit queue an element to be deleted which is not the last one..

## Fehleraktion

Durch diesen Fehler wird keine Aktion ausgeführt.

## Troubleshooting

The error can be acknowledged by an Error-Reset.