Siemens 353 User Manual

UM353-1B Factory Configured Options
April 2012
4-13
4.8 FCO121 - Cascade Control
Factory Configured Option FCO121 provides two loops configured for Cascade control. The block diagram of the
configuration of the two loops is shown below along with the changes made to the default parameter values of the
configured blocks. The process range of the Primary loop can be changed in Analog Input 1 and the range of the
Secondary loop in Analog Input 2. Also, the output range of the primary PID controller must be changed to match
any new range in the secondary loop. If the loop tag ‘PRIM’ or ‘SEC’ is changed, all configured references will
automatically be changed to the new tag.
PB2SW
PS
E/I
O1
SE
SI
IS
ES
NC
NO
MD
ST
E
I
IO
SETPT
TV
TC
O1
AIN1
QS
O1
ALARM
A1
A2
A3
A4
A/M
O1
AS
NA
MS
ES
SS
PID
O1
AE
AW
SR
P
D
A
TV
TC
EM
P
S
F
A
I
LU
LD
Primary Process
S
P
V
SETPT
TV
TC
O1
AIN2
QS
O1
AOUT1
QS
ALARM
A1
A2
A3
A4
A/M
O1
AS
NA
MS
ES
SS
SPLIM
HS
O1
LS
PID
O1
AE
AW
SR
P
D
A
TV
TC
EM
S
D
P
S
F
A
I
A
LU
LD
Valve
Secondary Process
S
P
V
OR02
O1
A
B
C
PRIM (Primary)
SEC (Secondary)
OR01
O1
A
B
C
(Rev. 2)
Primary Loop
SETPT - Setpoint Function Block
RG PTR - Range Pointer --------- PRIM.AIN1.OR
INPUT TV - Input TV ------------ PRIM.AIN1.O1
INPUT TC - Input TC ------------ PRIM.A/M.NA
ESN - Exec. Seq. No.------------- 5
ALARM - Alarm Function Block
RG PTR - Range Pointer -------- PRIM.AIN1.OR
INPUT P - Input P --------------- PRIM.AIN1.O1
INPUT D - Input D -------------- PRIM.SETPT.O1
ESN - Exec. Seq. No. ----------- 10

Siemens 353 Specifications

General

CPU	CPU 353
Inputs	16 digital inputs, 24 V DC
Outputs	16 digital outputs, 24 V DC, 0.5 A
Communication	MPI
Power Supply	24 V DC