Modbus Slave Devices; Function Description; Configuration And Value View Via The User Interface - Siemens SICAM Q100 7KG95 Series Manual

Basic Functions
2.6 Serial Communication
Commissioning
If a Modbus slave device is connected correctly, the serial parameters (baud rate and parity) are identical to
the parameterization in the Modbus RTU master of the device, the device address was checked, and the errors
no responses or CRC errors still occur (sporadically), proceed as follows:
•
Try to increase the Response timeouts. Some devices may take longer to respond (in particular when
reading a larger number of values with 1 message) or at low baud rates.
•
Try to increase the Additional inter-character timeout. There may be larger message gaps during the
transmission or a device needs a longer bus silent interval.

Modbus Slave Devices

2.6.3
2.6.3.1

Function Description

For the correct functioning of the Modbus RTU Master, the Modbus RTU Master must know all Modbus slave
devices which are connected to the RS485 interface. Also the data which the devices must read must have
been defined.
NOTE
i
i
Modbus slave devices can only be parameterized if you select the communication protocol Modbus
RTU Master.
You can parameterize up to 8 Modbus slave devices. They can be selected in the 2 groups Modbus slave
devices 1-4 and Modbus slave devices 5-8.
The parameterization of the 8 Modbus slave devices is identical and described only for the Modbus slave
device 1 in the following.
NOTE
i
i
The parameterization sequences for the Modbus RTU Master and the Modbus Gateway are described in
detail in chapter
2.6.3.2

Configuration and Value View via the User Interface

Basic Settings
To change the basic settings for Modbus slave devices in the Configuration tab, proceed as follows:
•
In the navigation window, click Modbus slave devices 1-4.
[sc_Config Modbus slave devices, 2, en_US]
Figure 2-35
•
Configure the respective parameters according to the following table.
74
2.5.3 Modbus TCP to Modbus RTU
Configuration Tab, Modbus Slave Devices, Device 1 Activated
Gateway.
SICAM, SICAM Q100 7KG95xx, Manual
E50417-H1040-C522-A9, Edition 06.2021