Siemens SIMATIC TI505 User's Guide download pdf (Page 27)

Simatic/TI 505 Ethernet Driver Help

Element LVF bit Description

A 0/1, 15/16 1=Go to manual mode*

B 1/2, 14/15 1=Go to auto mode*

C 2/3, 13/14 1=Go to cascade mode*

D 3/4, 12/13 D E=description**

0 0=Loop is in manual mode

1 0=Loop is in auto mode

0 1=Loop is in cascade mode

E 4/5, 11/12

F 5/6, 10/11 0=Error is positive

1=Error is negative

G 6/7, 9/10 1=PV is in high-high alarm

H 7/8, 8/9 1=PV is in high alarm

I 8/9, 7/8 1=PV is in low alarm

J 9/10, 6/7 1=PV is in low-low alarm

K 10/11, 5/6 1=PV is in yellow deviation alarm

L 11/12, 4/5 1=PV is in orange deviation alarm

M 12/13, 3/4 1=PV is in rate-of-change alarm

N 13/14, 2/3 1=Broken transmitter alarm

O 14/15, 1/2 1=Loop is overrunning

P 15/16, 0/1 Spare: Set to 0

*Elements A, B and C are write-only triggers. Write 1 to set the mode. The element will always show a value of 0

(zero).

**Elements D and E will indicate the mode that the loop is in. These elements are read only.

Note: Elements F through P are read only and indicate the error and alarm state that the loop is in.

LCF Bit Definitions

Loop Control Flag Data Element Format

The server default settings are shown in bold.

MSB LSB

ABCD EFGH IJKL MNOP QRST UVWX YZab cdef

The LCF bit has the following format:

V/W, X/Y

V=0-based bit addressing. Bit 0 is MSB.

W=1-based bit addressing. Bit 1 is MSB (Simatic 505 documentation).

X=0-based bit addressing. Bit 0 is LSB.

Y=1-based bit addressing. Bit 1 is LSB.

Element LCF bit Description

A 0/1, 31/32 0=PV scale 0% offset

1=PV scale 20% offset - only valid if PV is unipolar. Refer to Element U.

B 1/2, 30/31 1=Take square root of PV

C 2/3, 29/30 1=Monitor HIGH/LOW alarms

D 3/4 28/29 1=Monitor HIGH-HIGH/LOW-LOW alarms

E 4/5, 27/28 1=Monitor yellow/orange deviation alarm

F 5/6, 26/27 1=Monitor rate-of-change alarm

G 6/7, 25/26 1=Monitor broken transmitter alarm

H 7/8, 24/25 PID algorithm type

0=Position algorithm

1=Velocity algorithm

I 8/9, 23/24 0=Direct acting

1=Reverse acting

J 9/10, 22/23 1=Control based on error squared

K 10/11,

21/22

1=Control based on error deadband

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Siemens SIMATIC TI505 User's Guide Page 27

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