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11.10 Interlocking

11.10.1 Interlocking from SCADA system via GSM/GPRS

Interlocking can be done from a Modbus master (like a SCADA
system) via the Modbus interface.
To find the parameter in the CU 36X, go to Settings >
Communication settings > SCADA settings >
• SCADA PIN code (if PIN code protection is used).
• SCADA PIN code enabled/disabled.
Settings > Communication settings > Interlock settings >
• Incoming interlock enabled.
For further information, see installation and operating instructions
for Dedicated Controls.

Interlocking procedure

1. The Modbus master (e.g. SCADA system or PLC) writes the

correct SCADA PIN code to the ScadaPinCode (register
00109) if PIN code protection is enabled.

2. The CU 36X Modbus slave verifies that the written

ScadaPinCode (register 00109) register value corresponds to
the SCADA PIN code entered by the user (CU 36X or PC Tool
WW Controls). If the codes match, the slave will accept data
writing from SCADA.

3. The Modbus master writes the InterlockTimeout (register

00226) if this value should be controlled from the master
application. If it is not written, the existing value will be used.

4. The Modbus master raises the interlock bit

PitControl.InterlockPit (register 00101, bit 3), which will bring
the CU 36X into "interlock" mode. An interlock timeout is
initiated, corresponding to the current value of the
InterlockTimeout (register 00226) in the Modbus profile.

5. The Modbus master can any time bring the CU 36X Modbus

slave back into "Auto" mode by raising the PitControl.AutoPit,
register 00101, bit 4.

11.10.2 Interlocking from another controller via SMS

Figure

and

illustrates the CU 36X SMS interlocking

mechanism. The CU 36X interlock master issues an SMS
command containing a 4-digit PIN code "pppp" matching the SMS
PIN code of the interlock slave CU 36X. Following the PIN code is
the interlock command "INTERLOCK" with an interlock timeout
value mmmm counting in minutes. Timeout values allowed:
1-1440 minutes (= 24 hours).
If the interlock is accepted (correct PIN code, correct command
and valid interlock timeout value), the interlock slave will change
its operating mode to "Interlock control".
The SMS PIN code in the interlock SMS command is optional if
the authentication method is "Both" and the interlock master
phone number is present in the interlock slave SMS phone
number list.
The interlock timeout value, however, is always optional. If it is
not included, the previously received value will be used.
By issuing the "Auto" command, the interlock master can instantly
terminate interlocking: "pppp AUTO".
The function of interlocking by SMS has the natural consequence
that interlocking is also possible via a mobile phone. In this case,
the user will be able to see the acknowledgement SMS (positive
or negative) replied back from the CU 36X.
The CU 36X interlock master can interlock up to three CU 36X
interlock slaves, each represented by a set of parameters that
have to be configured in the master for each of them.
To find the parameter in the CU 36X, go to Settings >
Communication settings > Interlock settings > Interlock, pit 1 >
• Outgoing interlock slave phone number
• Outgoing interlock SMS PIN code
• Outgoing interlock SMS PIN code enabled
• Outgoing interlock timeout.
The interlock slave has to be configured as described in the
installation and operating instructions for Dedicated Controls.
To find the parameter in the CU 36X, go to Settings >
Communication settings > SMS authentication >
• SMS PIN code

pppp

• SMS authentication method ("Via phone number", "Via PIN

code", "Both" or "None").

Settings > Communication settings > Interlock settings >
• Incoming interlock enabled.

Fig. 24

Interlocking from SCADA

Note

The SCADA system can verify that write access is
granted by reading the PitStatus.WriteAccess
(register 00202, bit 5) which will be logical 1 if write
access is granted.

Note

Whenever a rising edge PitControl.InterlockPit is
generated, the interlock timeout will be reinitialised
with the value of the InterlockTimeout register. This is
used to prolong an interlock mode.