Phoenix Contact SCK-M-U-1500V handleiding

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SCK-C-MODBUS SOLARCHECK communication module

105608_en_02 PHOENIX CONTACT 33

5.2.1 SCK-internal communication cycle

In the SCK-internal communication cycle, all connected measuring modules are queried in

parallel based on a fixed defined request signal. The transmitted measured values are

saved to the corresponding registers. This request cycle permanently runs automatically.

The baud rate is fixed at 1200 baud. Depending on the amount of data transmitted, the cycle

time is around 1 s to 2 s on average.

New measured values are therefore only available in the registers of the communication

module for the higher-level controller, once a cycle has been completed (see Figure 5-3 on

page 32).

In the event of a data transmission error between the measuring and communication mod-

ules, the data is requested again up to three times. If no valid data is available after the third

request, the device indicates an internal error.

If the module does not receive a response after 10 s, it enters the “Timeout” status.

For additional details on error messages, refer to Section “Troubleshooting” on page 73.

5.2.2 RS-485 communication

The register entries (measured data) are transmitted to the higher-level controller via the

RS-485 interface using Modbus/RTU.

A unique address is set on the communication module for module and data assignment.

The DIP switches inside the device are used for this. The procedure for setting the module

address is described in Section “Installing the SCK-C-MODBUS communication module”

on page 49.

For additional information on setting the module address, refer to Section “Addressing the

SCK-C-MODBUS communication module” on page 49.

Assign appropriate addresses from 1 to 247 in accordance with your system configuration.

By default, the address area from 248 to 255 is assigned to non-stationary devices and can-

not be used.

Table 5-1 Modbus settings

Protocol Modbus/RTU

Valid addresses 1 ... 247

Default setting: 0

“0” is an invalid address and must be changed.

Baud rate Default setting: 9600 bps

Parity Default setting: none

Stop bits Default setting: 1

Code 8-bit, binary

Function code Function for reading the SCK Modbus measured values. All mea-

sured values are stored in a 16-bit word.

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