Siemens SIMOCODE pro C, System Manual

Page: 268 / 408

Commissioning, service, troubleshooting
13.2 Commissioning
SIMOCODE pro
268
System Manual, 05/2019, A5E40507475002A/RS-AD/004
● Baud rate: The baud rate of SIMOCODE pro V Modbus can be set in the range from 0.3 -
57.6 kbps. The parameter setting "auto" activates automatic baud rate detection with
which the device autonomously determines the setting selected by the controller.
Automatic baud rate search encompasses baud rates in the range from 4.8 ... 57.6 kbps.
Note
Automatic baud rate detection
Use of this function is only possible when the "Watchdog" function is activated.
Idle time:
Messages begin and end with a transmission break of at least 3.5 characters. The
shortest idle time depends on the baud rate. The following table shows the default values:
Bits per second (bps) Shortest idle time (ms)
300 128
600 64
1200 32
2400 16
4800 8
9600 4
19200 2
57600 2
● Baud rate (detected): Information about the detected baud rate, if automatic baud rate
detection (baud rate = auto) is set.
● Modbus address: Setting the Modbus address for the SIMOCODE device. The address
can be set in the range from 1 - 247. As supplied, the address for SIMOCODE pro V
devices is set to the default value of 126
● Port configuration: The number of stop bits and the selected parity of the Modbus
interface can be set here. The following settings are possible:
–
8E1 - 1 stop bit, even parity
– 8O1 - 1 stop bit, odd parity
– 8N2 - 2 stop bits, no parity
– 8N1 - 1 stop bit, no parity
● Wait time / wait time (default value): The time duration of the pause between a received
request and the reply from SIMOCODE pro can be set with the "Wait time" and "Wait time
(default value)" parameters. If the default value of the Modbus specification is to be used,
selection of the "Wait time (default value)" parameter is recommended. The "Wait time"
parameter is available for free setting. The setting is made in ms. The smallest settable
value corresponds to the default value of the Modbus specification. If longer wait times
are required, these can be defined using the "Wait time" parameter.
● Watchdog / Watchdog time: Monitoring of the bus communication can be activated with
these parameters. This is necessary when automatic baud rate detection is selected, or if
the SIMOCODE device were to experience a fault if the bus communication fails. If the
watchdog is activated, SIMOCODE monitors whether a valid read or write access to the
device occurs within the set watchdog time. If this is not the case, SIMOCODE begins a
new search for a valid baud rate if automatic rate detection is set. In addition, a "Fault -
bus" is generated if the "Watchdog → Bus monitoring" parameter is also activated.