5 Function blocks
5.29 SP, serial protocol
246 Control Relay easy800 11/11 MN04902001Z-EN www.eaton.com
You create the text with the D text display function block. After you have
dragged the coil (D..EN) onto the circuit diagram or the function block onto
the function block diagram you can enter the text and variable in the
Parameters tab. Entry via display/keypad is not possible. Four lines of
16 characters each are available for characters.
A D function block and an SP function block must be interlinked for text
output by assigning both function blocks with the same function block
number. To send a new text, a new D and SP function block combination
must be created.
The text is output with every activation of the trigger coil SP..T, which also
contains the function block number in its identifier, such as SP01T.
The SP function block accesses the D function block with the same number
(01). The individual characters of the D function block including blanks are
sent and shown in succession, for example, on a terminal: Starting with the
leftmost character in the first row of the entry field up to the rightmost
character of the fourth row. If a variable that is continually updated is to be
displayed in the text, the enable coil of the D function block (D..EN) must
have picked up.
If you are using several SP function blocks that are all activated with EN = 1
in your program, and which receive a send job at the same time with T = 1,
the control relay then processes all jobs in succession before it can start with
a new job.
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As a large amount of memory is required for text output, the
following solution should be used with networked control
relays: one control relay (text output relay) is used for the entire
text output. With 32 SP and D function blocks, this can output
up to 32 texts. The text output is initiated by other control relays
in the network. The network bit data SN is used by the control
relays to send a signal to the text output relay, which in turn
outputs the assigned text. The assignment of the received RN
network bit data and the SP function block must be
programmed in the text output relay.
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