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Modbus TCP
The SBPC-21-EN conforms to Modicon Open Modbus/TCP Specification, Release 1.0 (March 29,
1999). The SBPC-21-EN provides complete Class 0 conformance, complete Class 1 conformance,
and partial Class 2 conformance. The SBPC-21-EN can handle 8 simultaneous connections.
The following table lists the Modbus functions supported by the SBPC-21-EN:
Table 1-4
CODE FUNCTION NAME CLASS AFFECTS AREA
ADDRESSING
METHOD
01 Read Coils 1 IN/OUT Bit
02 Read Input Discretes 1 IN/OUT Bit
03 Read Multiple Registers 0 IN/OUT Word
04 Read Input Registers 1 IN/OUT Word
05 Write Coil 1 OUT Bit
06 Write Single Register 1 OUT Word
07 Read Exception Status 1 - -
15 Force Multiple Coils 2 OUT Bit
16 Force Multiple Registers 0 OUT Word
22 Mask Write Register 2 OUT Word
23 Read/Write Registers 2 IN/OUT Word
The following table lists the Modbus/TCP error codes:
Table 1-5
EXCEPTION
CODE NAME DESCRIPTION
01 Illegal Function The SBPC-21-EN does not support the function code in the query.
02 Illegal Data Address The data address received in the query is outside the initialized memory area.
03 Illegal Data Value The data in the request is invalid.
07-02-2004
Figure Sheet 1-849-C Page 11