Error Error cause 2.3 Remedy
HMI displays alarm 120202
"Wait for connection to NC/
PLC" and/or no values (only
'#').
The PCU has an IP address that does not
belong to the network or has an invalid IP ad‐
dress.
The TCU support is activated on the PCU (=
DHCP is enabled) and the PCU is active
DHCP-/DNS server (either as a result of the
DHCP SyncMode ON_MASTER or as a re‐
sult of the Sync priority - just the same as the
other server candidates and random selec‐
tion). The PCU is set with an incorrect IP ad‐
dress and an incorrect IP range for the IP ad‐
dresses that can be dynamically allocated.
The PCU possibly changed from DHCP
standby to active server as the computer with
DHCP MASTER has failed or been switched-
off.
Correctly set the network settings for the sys‐
tem network in the Windows service mode
(set the fixed specified IP address and subnet
mask for the system network, use the address‐
ing mode, fixed IP address).
Execute the following actions using the "Sys‐
tem Network Center" program:
● Connect the DHCP service to the interface
for the system network
● Set the DHCP mode (TCU support, DHCP
SyncMode, address range of the
addresses that can be assigned)
● Initiate DHCP clear
In addition, at the station with DHCP master
(DHCP SyncMode = ON_MASTER) a DHCP
clear should be initiated.
Error Error cause 2.4 Remedy
HMI displays alarm 120202
"Wait for connection to NC/
PLC" and/or no values (only
'#').
The PCU has an IP address that does not
belong to the network or has an invalid IP ad‐
dress.
TCU boot support is activated on the PCU (=
DHCP is enabled) and the PCU is the stand‐
by DHCP/DNS server (i.e. in the role of the
DHCP client). An additional active DHCP
server was switched into the system network
while operational; this active DNCP server al‐
so has an incorrect address range. This is a
configuration error.
Correctly set the network settings for the sys‐
tem network in the Windows service mode
(set the fixed specified IP address and subnet
mask for the system network, use the address‐
ing mode, fixed IP address).
Execute the following actions using the "Sys‐
tem Network Center" program:
● Connect the DHCP service to the interface
for the system network
● Set the DHCP mode (TCU support, DHCP
SyncMode, address range of the
addresses that can be assigned)
● Initiate DHCP clear
In addition, at the station with DHCP master
(DHCP SyncMode = ON_MASTER) a DHCP
clear should be initiated.
Switch the complete system off and on again.
Error Possible error causes and remedies
HMI displays alarm 120202 "Wait for connection to NC/PLC" and/or no values (only '#').
Error cause 3.1
The NCU has an IP address that does not match the network or has an invalid IP address.
The NCU does not participate in DHCP operation and runs with a permanently set IP address
that is incorrect and does not match the system network.
Remedy 3.1
Configuring the network
17.6 Station-related network diagnostics
SINUMERIK Operate (IM9)
386 Commissioning Manual, 12/2017, 6FC5397-1DP40-6BA1
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