Siemens S7-1200 - ENDIS_PW (Enable;Disable CPU Passwords) Instruction

Basic instructions
7.8 Program control operations
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
259
Sample steps for using the RET instruction inside an FC code block:
1. Create a new project and add an FC:
2. Edit the FC:
– Add instructions from the instruction tree.
– Add a RET instruction, including one of the following for the "Return_Value"
parameter:
TRUE, FALSE, or a memory location that specifies the required return value.
– Add more instructions.
3. Call the FC from MAIN [OB1].
The EN input on the FC box in the MAIN code block must be true to begin execution of the
FC.
The value specified by the RET instruction in the FC will be present on the ENO output of the
FC box in the MAIN code block following execution of the FC for which power flow to the
RET instruction is true.
7.8.5
ENDIS_PW (Enable/disable CPU passwords) instruction
Table 7- 101 ENDIS_PW instruction
LAD / FBD
SCL
Description
ENDIS_PW(
req:=_bool_in_,
f_pwd:=_bool_in_,
full_pwd:=_bool_in_,
r_pwd:=_bool_in_,
hmi_pwd:=_bool_in_,
f_pwd_on=>_bool_out_,
full_pwd_on=>_bool_out_,
r_pwd_on=>_bool_out_,
hmi_pwd_on=>_bool_out_,
The ENDIS_PW instruction can allow and
disallow client connections to a S7-1200
CPU, even when the client can provide the
correct password.
This instruction does not disallow Web
server passwords.
Table 7- 102 Data types for the parameters
Parameter and type
Data type
Description
REQ
IN
Bool
Perform function if REQ=1
F_PWD
IN
Bool
Failsafe password: Allow (=1) or disallow (=0)
FULL_PWD
IN
Bool
Full access password: Allow (=1) or disallow (=0) full access password
R_PWD
IN
Bool
Read access password: Allow (=1) or disallow (=0)
HMI_PWD
IN
Bool
HMI password: Allow (=1) or disallow (=0)
F_PWD_ON
OUT
Bool
Failsafe password status: Allowed (=1) or disallowed (=0)
FULL_PWD_ON
OUT
Bool
Full access password status: Allowed (=1) or disallowed (=0)