GE IC220SDL953, Руководство пользователя, Страница: 81 / 124

A
GFK-2731 Chapter A A-5
VersaSafe island Each VersaSafe island comprises one VersaSafe module with integrated safety logic
(IC220SDL953) and up to five distributed VersaSafe modules without safety logic
(e.g., IC220SDL543, IC220SDL...). The module with integrated safety logic is referred to
as the island node, while the modules without safety logic are referred to as remote devices
or satellites. Satellite is the preferred term to describe these modules and is used in this
document.
The satellites and the IC220SDL953 are assigned to an island using island numbers that
are specified in the parameterization tool. The satellites are numbered in the order they are
assigned in VersaConf Safety.
A 2.2 Network and controller requirements
The VersaSafe system does not place any special requirements on the standard controller.
However, it must be able to perform the following tasks:
Network:
– Deterministic network; pauses caused by sporadic errors must not exceed the
watchdog time set for the module
Controller:
– Fast enough that it can meet time expectations for the response time
– Sufficient memory to save configuration and parameter data records
– Ensuring data consistency when copying data
Data consistency must at least be ensured using the data telegram of a module.
A 2.3 Safe input and output devices
Safe input and output devices form the interface to connected I/O devices. The devices
control contactors or valves, for example, and/or read the input status of connected safety-
related sensors.
The internal structure of the devices enables component failures, interruptions in
transmission or the absence of data to be detected and reported immediately.
Even errors in the wiring or internal device errors can be detected. Errors are indicated via
the process image of the devices, the function blocks, and the device LEDs. They can be
evaluated by the user.
The safe I/O devices are from the VersaPoint product range. Their design and interfaces
correspond to standard VersaPoint I/O devices. This means that no additional installation
effort is required.
The devices are parameterized using the VersaConf Safety software according to the
safety function that is to be performed. The parameterization and wiring of the inputs and
outputs depends on the application (e.g., single-channel or two-channel). For more
detailed information about the parameterization options, please refer to the user manual
for the relevant device. The wiring and parameterization of devices determines which
errors are detected.
Function blocks for copying data and downloading the configuration are available for
selected controllers.