Siemens SIMATIC S7-1200 System Manual page 1195

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Table 13- 71 Data types for the parameters

Parameter and type

S7-1200 Programmable controller

System Manual, V4.2, 09/2016, A5E02486680-AK

A low to high (positive edge) signal starts the operation.

(Version 2.0 only)

After you install and configure a CM or CB communication device, the

port identifier appears in the parameter helper drop-list available at the

PORT box connection. The assigned CM or CB port value is the device

configuration property "hardware identifier". The port symbolic name is

assigned in the "System constants" tab of the PLC tag table.

Baud rate selection:

300, 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 76800, 115200,

all other values are invalid

Parity selection:

Flow control selection:

0 – (default) no flow control

1 – Hardware flow control with RTS always ON (does not apply to

RS485 ports)

2 – Hardware flow control with RTS switched

RTS ON delay selection:

0 – (default) No delay from RTS active until the first character of the

message is transmitted

1 to 65535 – Delay in milliseconds from RTS active until the first char-

acter of the message is transmitted (does not apply to RS485 ports).

RTS delays shall be applied independent of the FLOW_CTRL selec-

RTS OFF delay selection:

0 – (default) No delay from the last character transmitted until RTS

goes inactive

1 to 65535 – Delay in milliseconds from the last character transmitted

until RTS goes inactive (does not apply to RS485 ports). RTS delays

shall be applied independent of the FLOW_CTRL selection.

Response timeout:

Time in milliseconds allowed by the Modbus_Master for the slave to re-

spond. If the slave does not respond in this time period, the Mod-

bus_Master will retry the request or terminate the request with an error

when the specified number of retries has been sent.

5 ms to 65535 ms (default value = 1000 ms).

A reference to the instance data block used by the Modbus_Master or

Modbus_Slave instructions. After Modbus_Master or Modbus_Slave is

placed in your program, the DB identifier appears in the parameter helper

drop-list available at the MB_DB box connection.

The DONE bit is TRUE for one scan, after the last request was completed

with no error. (Version 2.0 only)

Communication processor and Modbus TCP

13.5 Modbus communication

Siemens SIMATIC S7-1200 System Manual page 1195

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