3.3 Integration for PCS7 control system
The following instructions must be observed on integrating the positioner into a Siemens
Simatic S7 control system to ensure that the positioner functions properly:
1. The module in Slot 1 can be read out over the function component SFC 14 DPRD_DAT
and, for example, assigned to a data module.
2. Existing modules in Slot 2 and/or Slot 3 need to be allocated over the MOVE command
as the use of SFC 14 is not permissible in this case.
Note:
–
Data consistency is first provided from a data length of 3 bytes or 5 bytes.
–
Use the MOVE command for data types BYTE, WORD and DWORD.
–
If the SFC 14 is to be used over several slots, do not forget that the data length is always
to be regarded separately for each slot!
3.4 General instructions to start up the positioner
The positioner remains in the fail-safe position until it receives a valid setpoint from the pro-
cess control system (status < 0x80).
S
blinks on the positioner display to indicate that the
positioner is in the fail-safe position (see EB 8384-4 EN). First when a valid setpoint (status
³
0x80) is set, the positioner leaves the fail-safe position and follows the reference variable.
14 KH 8384-4 EN
Cyclic data exchange
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