28.9.20
Fieldbus-Gateway UNIGATE
®
CX C4Map - PROFIBUS V. 1.0
17
Deutschmann Automation GmbH & Co. KG
Implemented protocols in UNIGATE® CX C4Map
7.1.2.3
Display of the node guarding states
Node guard mapping is used to display the node guard states of the individual slaves to the field-
bus. 8 slaves are always represented in one byte; So exactly one bit of information is reserved
for a slave. This information can be displayed anywhere in the fieldbus data of the gateway, i.e. it
is shown in the input area of the fieldbus master for this gateway.
Display of the node guarding information
Distribution of the bits for nodes 1- 8:
node 1-8
Byte MSB (Bit 7)
...
LSB (Bit 0)
Slave node ID 8
...
Slave node ID 1
If no node guard is activated for a slave, the slave has failed or no node guarding information has
been exchanged, the corresponding bit for this slave is 0. The bit is 1 if node guarding was acti-
vated for this slave and the slave for the node Guarding requests answered in the appropriate
time.
Example: Node guarding is activated for nodes 1 and 2. Slave 1 does not respond to node guar-
ding, slave ID 2 works normally. A mapping of the information in the fieldbus is entered in the 2nd
byte.
Fieldbus data of the Gateway:
Byte 0
Byte 1
Byte 2
Byte 3
Byte 4
xx
xx
0x40
xx
xx
7.1.2.4
Emergency Messages
The gateway can receive up to 10 emergency messages from all slaves for which node guarding
has been activated and writes them to a queue. At the same time, an internal counter is increa-
sed that contains the number of EMCY messages received. Both the data of the current mes-
sage and the number of EMCY messages received and the Node ID of the sender of the
message can be displayed in the fieldbus output data of the gateway. The next message can be
called up via the control byte. If the data of the EMCY message are shown in the bus data, the
new data is already visible in the fieldbus when the data is toggled.
Setting the emergency messages
Содержание UNIGATE CX C4Map
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