Siemens SIMATIC MV540 H - Page 118

Process interfacing via an automation system (PLC, PC)
9.3 Control with Ident profile
SIMATIC MV500
118 Operating Instructions, 06/2018, C79000-G8976-C494-01
Command: Set digital out
Writing command data
The command data to be "written" in the "PHYSICAL WRITE" command contains the
command identifier and six parameters.
With this command, the four logical signals "EXT_1", "EXT_2", "EXT_3" and "EXT_4" can be
set and linked to other logical signals. These signals can only be set through an automation
system. In addition, these signals can be applied to the available digital output pins via the
WBM.
Receipt of this command is logged in the diagnostics data records. If the command contains
an invalid parameter, a negative acknowledgement is sent.
The "PHYSICAL WRITE" command must specify the length "0x07"
("CMD_STRUCT.LEN_DATA = 0x07"); otherwise, the command receives a negative
acknowledgment.
Table 9- 22 CMD_STRUCT
Parameter
Value
CMD
0x71
OFFSETBUFFER 0x00
EPCID_UID
0x00
LEN_DATA
0x07
ADDR_TAG
0x00
Table 9- 23 Memory area of the receive data (TXREF or RXREF)
Address
Value
Meaning
0x0000 0x08 Command identifier "Set digital out".
0x0001 0x01 ... 0x04 Number of the logical external signal. Corre-
sponds to "EXT_1", "EXT_2", "EXT_3" and
"EXT_4".
0x0002 0x00 ... 0x02 Level of the signal
• 0x00: Set level statically to "low".
• 0x01: Set level statically to "high".
• 0x02: Set level for configured pulse time to
"high".