E/I - External/Internal Transfer Switch - Siemens Moore 353 User Manual

UM353-1

3.2.47 E/I - External/Internal Transfer Switch

E/I function blocks can be used on a one per loop
basis to select an analog signal, connected to input E
(External) or input I (Internal), as a setpoint for the
loop controller.
The position of the E/I switch can be changed on each
positive transition of input ST and will normally be
connected to the PS output of pushbutton block
PB2SW, configured for momentary action. The SE
output will normally be connected to the MD input of
pushbutton block PB2SW. E/I switch position will be
shown on the operator faceplate by a lighted LED:
green for E, red for I.
The E/I switch position can also be changed by
command over the Modbus or LIL network.
When PU LAST is set to YES, the E/I switch will
power up in the last position during a hot or a warm
start. During a cold start, it will power up in the
position set by the POWER UP parameter. If PU LAST is set to NO, the E/I switch will power up in the last
position during a hot start, but during a warm or cold start will power up in the position set by the POWER UP
parameter.
The IO (Internal Override) input enables a HI (1) input to temporarily select the Internal Input as the function block
output O1. This input does not affect the position of the E/I switch.
Outputs SE and SI indicate the actual position of the E/I switch. SE is HI (1) when in the E position and LO (0)
when in the I position. SI is HI when in the I position and LO when in the E position. Outputs IS and ES indicate
the actual source of the block output. IS is HI when O1 is the Internal input and is LO when O1 is the External
input. ES is HI when O1 is the External input and is LO when O1 is the Internal input.
March 2003
Switch Transfer
Internal Override
P O
EI Transfer Switch
Switch Transfer
ST
Switch Control
1
0
0
1
E
External
E/I
I
Internal
IO
Internal Override
BLOCK DIAGRAM
E/I TRANSFER SWITCH
ESN = 000
E/I
ST
E/I
E
External Input
TRANSFER SWITCH
I
Internal Input
IO
W E R U P
POWER UP position
P U L A S T
Power Up LAST
I N P U T S T
INPUT ST .............
(H)
I N P U T E
...............
INPUT E
(H)
I N P U T I
.................
INPUT I
(H)
I N P U T I O
INPUT IO ..............
(H)
E S N
Exec. Seq. No.
(H)
Network Command
SE
Switch position E
Switch position I
O1
Output 1
Internal Status
ES
External Status
Function Blocks
O1 Output 1
SE Switch position E
Switch position I
SI
IS Internal Status
ES External Status
......................... E/I (I)
(S)
....................... NO/YES (YES)
(S)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
loop tag.block tag.output (null)
...................... 001 to 250
SI
IS
3-53