Siemens SIMATIC S7-400H System Manual page 251

LED LINK OK
During commissioning of the fault-tolerant system, you can use the "LINK OK" LED on the
synchronization module to check the quality of the connection between the CPUs.
LED LINK OK
Lit
Flashing
Unlit
OB 84
When operating in redundant mode, the CPU operating system calls OB 84 if it detects a
reduced performance in the redundant link between the two CPUs.
Fiber-optic interfaces of unused modules
Fiber-optic interfaces of unused modules must be sealed by dummy plugs during storage to
protect the optical equipment. The plugs are in the synchronization module when shipped.
Technical specifications
Technical specifications
Maximum distance between the
CPUs
Supply voltage
Current consumption
Power loss
Wavelength of the optical transceiver
Maximal permitted attenuation of the
fiber-optic cable
Maximum permitted difference in
cable lengths
Dimensions W x H x D (mm)
Weight
S7-400H
System Manual, 09/2007, A5E00267695-03
Meaning
The connection is OK
The connection is not reliable, and the signal is disrupted
Check the connectors and cables
Check whether the fiber-optic cables are installed according to the guidelines
in section Installation of fiber-optic cables (Page 252)
The connection is interrupted, or there is insufficient light intensity
Check the connectors and cables
Check whether the fiber-optic cables are installed according to the guidelines
in section Installation of fiber-optic cables (Page 252)
6ES7 960–1AA04–0XA0
10 m
5.1 V, supplied by the CPU
210 mA
1.1 W
850 nm
7 dB
9 m
25 x 53 x 140
0.065 kg
Synchronization modules
15.1 Synchronization modules for S7-400H
6ES7 960–1AB04–0XA0
10 km
5.1 V, supplied by the CPU
250 mA
1.3 W
1300 nm
12 dB
50 m
25 x 53 x 140
0.065 kg
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