Phoenix Contact SCK-M-U-1500V Handleiding (128 Pagina's)

Handleiding

SOLARCHECK family

34

PHOENIX CONTACT 105608_en_02

You must design the Modbus data request for the communication module in accordance

with the following schematic:

Example data record:

Request for module information data from module no. 3:

Tx: 03 03 04 B1 00 15 D4 F0

Response from module:

Rx: 03 03 2A 00 01 01 23 45 67 89 AB CD EF 43 53 2D 4B 2D 43 4F 4D 42 44 53 55 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 97 3A

Response in plain text:

03  Addressed module ID

03  Function code

2A  Number of subsequent bytes (here: 42 bytes, 21 registers)

00 01  Module ID (SCK-C-MODBUS module type)

01 23 45 67 89 AB CD EF  4 registers, module serial number

43 53 2D 4B 2D 43 4F 4D 42 44 53 55 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00  Module designation in ASCII code: “SCK-C-MODBUS” (32 characters used as

a maximum)

97 3A  Checksum

5.3 Register

The register is divided into the following areas:

– Data registers

– Process and module information data of SCK channels 1 to 8 (current measuring mod-

ule at T1 to T8)

– Process and information data of SCK-C-MODBUS

5.3.1 Register addresses

In general, 48 items of process data (abbreviated “PD” in Table 5-2) and 48 items of module

information data (abbreviated “MI” in Table 5-2) are available for each connected measuring

module. Various amounts of data are present depending on the device type; this data is suc-

cessively written to the available process data and module information data registers. The

communication module detects the connected measuring modules by their ID. This form of

detection means that invalid data and communication errors can be detected reliably.

Client

address

Function

code

Starting

register

Total number of

registers

Cyclic Redundancy

Check (CRC)

03 03 04B1 0015 D4F0

Client no. 3 Read holding

register

1201 21 Resulting checksum

Response: 03 03 xx xx xx xx xx ... (address + function code + data + CRC)

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