SAS 341, Communication Module
The SAS 341 is a serial communication module for use in S7-300*) systems. The SAS 341 permits the linking to the PLC of serial devices, such as barcode scanners, operator terminals, serial printers, PCs, PLCs of other manufacturers, and supports the ASCII, 3964R, and RK512 protocols.
The serial devices can be connected via RS232, TTY (20 mA), or RS422/RS485. The 9-way Sub-D socket (15-way in the case of RS422/485) with standard pin assignment is provided for connecting communicating devices.
The additional USB interface permits the connection of the PLC to PC systems, many of which no longer have a conventional physical port. A virtual COM port driver enables the use of software that still expects a COM port.
Extended functions, such as support for higher baud rates up to 115 kBaud, make the SAS 341 all the more versatile without any loss of compatibility.
Using the standardized RK512 computer link protocol, the linking of different types of PLC to the S7-300*) can be flexibly implemented.
The data handling blocks supplied enable simple and flexible integration into the PLC. The module is parameterized in the Hardware Configurator of the PLC.
To permit a higher integration density in the cabinet, the SAS 341 is also available with 2 serial interfaces. Both interfaces can be parameterized independently and are used in the PLC.
SAS 341-1, with Modbus RTU Driver
The „Modbus Master/Slave“ driver add-on facilitates communication with Modbus RTU capable devices. Using this driver the SAS 341 can work as either a Modbus RTU Master or Modbus RTU Slave.
The driver can be used with a SAS 341-1 with RS232 interface (700-341-1AH02) or with a SAS 341-1 with RS485 interface (700-341-1CH02). Point to point connections can be set up using the RS232 interface and using the RS485 interface, up to 32 users can be addressed in 2-wire half duplex mode.
When communicating with remote systems the Modbus RTU function codes 01, 02, 03, 04, 05, 06, 07, 08, 11, 12, 15 and 16 are supported.
Data transfer to and from the S7 CPU is handled block-wise via the accompanying function blocks.
Do you require a special protocol for your device? Just ask us!
*) S7-300 is a registered trademark of Siemens AG.