Network Read, Network Write - Siemens SIMATIC S7-200 System Manual

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SIMATIC Instructions

Network Read, Network Write

Inputs/Outputs

VB, MB, *VD, *AC, *LD

The Network Read 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 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 S7-200.

Figure 9-67 defines the table that is referenced by the

TBL parameter in the NETR and NETW instructions.

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)

S7-200 Programmable Controller System Manual

A5E00066097-02

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