8.7.3.3 Commissioning the Modbus module
Machine
Precondition Access level 2 is activated.
The network parameters are known. Request the required information from your IT department.
1. Open the 8.2
<Communication – Com-Module> menu.
2. Activate the
Com-Module Start check box.
The communication module is activated. The system detects the communication module type
and displays it in the
Type line.
3. Select the data exchange direction:
► SIGMA CONTROL 2 ⇆ Bus master (SIGMA CONTROL 2 sends process data and receives
control data):
Send/Receive or Master: Set Com module.
► SIGMA CONTROL 2 → Bus master (SIGMA CONTROL 2 sends process data):
Send or
Master: Setting SAM/JSON-RPC.
4. Set the slave address (
Slave No.:).
5. Set the required reaction in the event of a bus fault (see next chapter, “Reaction in a PROFI‐
BUS bus fault”).
6. Set the bus parameters.
Set the baud rate, number of stop bits, parity, time-out and mode as required by the bus mas‐
ter. See chapter 2 for the setting options and the default settings.
7. Start the communication module with the set parameters:
8. Activate the
Reset check box.
The communication module is started with the set parameters.
Communication with the bus master is running.
9. Time-out at bus fault is activated.
Bus communication is now monitored. The number behind
Status Counter (Run) continuously
changes during communication.
Reaction in a bus fault
Only for machines.
After switching on the power supply, the bus alarm can be suppressed for a definable period of
time. The setting depends on the time passing at the bus master between return of voltage and
start of communication via the bus.
Parameters
Factory setting
Set value
Start td
15 s
Tab. 70 Setting the
Starttd parameter
SIGMA CONTROL 2 monitors the bus communication at log level (Modbus). If there is a check box
behind
Communication error, this monitoring in the Send mode can be switched off by deactivating
the check box.
In
Send/Receive or Master modes, SIGMA CONTROL 2 can monitor: Com-Module the bus com‐
munication at user level. For this purpose, the bus master reads a value ("toggle bit") that changes
with every bus cycle and returns it without change. SIGMA CONTROL 2 returns a bus alarm if the
bit does not change for a time longer than set (
Timeout). Activate the check box to enable monitor‐
ing.
8
Initial Start-up
8.7
Setting the machine for master control operation
No.: 901700 14 E
Service Manual Controller
SIGMA CONTROL 2 BLOWER ≥ 4.0.X
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