Ethernet Communication (ISO on TCP) between SIMATIC S5 and
SIMATIC S7-1500 Controllers
Entry-ID: 109482475, V1.2, 07/2019
OB21/OB22 (STARTUP OBs)
The following functions are executed in the startup of the SIMATIC S5-CPU:
• The set interface (interface no. = 0) of the CP1430 TCP is initialized and
synchronized via the handling block "HTB_Synchron” (FB 249).
• An internal startup bit (M 184.5) resets the initial count value.
OB1 (cyclic OB)
The following functions are processed in the cyclic OB1 of the SIMATIC S5-CPU:
• This example scenario 2a is started by setting an enable bit (M 130.3).
• Call of the user communication block ID105_S7 (FB 33) which uses a time
trigger to call the send and receive functions via S5 handling blocks (HTBs)
and increments the count values in the data area.
• Call of the handling blocks SEND ALL and RECEIVE ALL for data transfer to
the CP1430 TCP.
FB33 (ID105_S7)
The function block FB 33 contains the time-triggered call of the send and receive
functions in which a simple simulation program demonstrates the exchange of
data.
• A restart of the communication is initiated via the startup bit M 184.5
(OB21/22).
• Every second (clock memory bit), a count value (in DB90) is sent to the S7-
1500 CPU via the ISO-on-TCP connection.
• After the data have been received, this count value is checked in the S7-1500,
incremented by +1 and sent back to the SIMATIC S5 at the next send trigger of
the S7-1500. The data received by the SIMATIC S5 are transferred to DB95.
• A simple error analysis regarding the connection status is done by storing the
indicator words and parameter error bytes.
HTB_SEND block: ANZW: MW90 PAFE: MB94
HTB_RECEIVE block: ANZW: MW95 PAFE: MB99
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