Network Read, Network Write Communications

Inputs/Outputs Operands Data Types
TBL VB, MB, *VD, *AC, *LD BYTE
PORT Constant BYTE

Memory Ranges ENO Errors Instruction Support for S7-200 CPUs SIMATIC/International Mnemonics
The Network Read (NETR) instruction initiates a communication operation to gather data from a remote device through the specified port (PORT), as defined by the table (TBL).

The Network Write (NETW) instruction initiates a communication operation to write data to a remote device through the specified port (PORT), as defined by the table (TBL).

The NETR instruction can read up to 16 bytes of information from a remote station, and the NETW instruction can write up to 16 bytes of information to a remote station. You may have any number of NETR/NETW instructions in the program, but only a maximum of eight NETR and NETW instructions may be activated at any one time. For example, you can have four NETRs and four NETWs, or two NETRs and six NETWs active at the same time in a given S7200.

NETR: Error Conditions that Set ENO = 0:

SM4.3 (run-time), 0006 (indirect address)

NETW: Error Conditions that Set ENO = 0:

SM4.3 (run-time), 0006 (indirect address)

Network Read/Write TBL Definition