OSx Station Basics1-10 SIMATIC PCS 7 OSx 4.1.2 Operator
PCS 7 OSx Stations (continued)
The presence of any other device that can sign on to the S7 controller also
reduces the number of OSx stations that can sign on for Alarm_8 and
Alarm_S messaging. For example, suppose that an S7 programming device
signs on to an S7-416 or S7-417 controller using the STEP 7
PLC-->CPU
Messages
command, while an eight-station OSx system is in the Offline
state. Now there are only seven slots available for sign-on. When the system
transitions to the Operate state, none of the eight OSx stations will be able
to sign on for RBE processing, since all OSx stations must have identical
RBE information. The S_CNODE report indicates
NORBE.AftertheS7
programming device signs off and eight slots are again available, a
Scan_On
command for the S7-416 or S7-417 controller issued from Network Setup
reestablishes the RBE connection for all eight OSx stations.
Alternatively, if a system with eight OSx stations is already in the Operate
state, an S7 programming device will not be allowed to sign on to the S7-416
or S7-417, unless you select the
Scan_Off command from Network Setup
first, turning off RBE delivery for OSx until the programming device signs
off. Another solution is to set one of the OSx stations to out_of_service,
freeing up one sign-on slot for the programming device.
If you are using any S7-414 controllers, you can connect up to four OSx
stations when only one CP443--1 module is present and used by OSx. The
presence of two CP443-1 modules (for dual or redundant connection)
reduces this number to three. The presence of any other device that can sign
on to the S7 controllers also reduces the number of OSx stations that can
sign on for Alarm_8 and Alarm_S messaging.
To avoid these situations altogether, the effective limit on the number of
OSx stations in a system with S7 controllers must be reduced by the
number of other devices that can sign on to the controllers. For example, in
a system with models of S7-416 controllers that support eight sign-ons, an
arrangement of seven OSx stations and one S7 programming device allows
all components to sign on at the same time with full RBE messaging
capability.
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