Specifications

Glossary

SCALANCE X-400 BA

150 Operating Instructions, 03/2009, C79000-G8976-C186-07

Digital input

A digital input is used to acquire binary file information. A state change can be logged in the

Log Table or reported by E-mail or traps. The voltage levels between – 30 V and + 3 V

correspond to logical state "0", voltage levels between + 13 V and + 30 V correspond to

logical state "1".

Dispersion

Broadening and distortion of light pulses in fiber-optic cable due to signals arriving at

different times. On multimode FOC, the distortion of the output signal is greater than with

single mode FOC.

Display mode (DMode)

Display mode that indicates various statuses (port status, power monitoring activated etc.).

The modes can be switched over using a button on the CPU module.

ESM

Electrical Switching Module – SIMATIC NET Ethernet switch with electrical ports.

Fault mask

Specifies the desired status (good status). Deviations from this occurring during operation

are handled as faults.

FO port

Fiber Optic port

Full duplex

Two-way simultaneous - both communication partners can send and receive at the same

time.

Half duplex

Two-way alternate transmission mode- it is only possible to either send or receive over the

interfaces at any one time.

High Speed Redundancy

Method used on SIMATIC NET switches to increase the network availability in a ring

topology.