The Word Lamp Object is used as an indicator to represent the value in a PLC register, or the value in a register in the HMI local memory (LW). Creates a graphics object to reflect the current state of a multi-state PLC data register. It can display a different shape or picture depending on the value in the register. If the value is 0, the first shape is displayed, if the value is 1, the second shape is displayed, etc. A Word Lamp can display up to 256 different shapes and text strings, corresponding to register values of 0 – 255.
There are four modes of operation available for the Word Lamp.
Value: The state of the Word Lamp is displayed according to the
value in the Read address. The Offset field will cause the Word Lamp
to display the state according to the value in the Read address + the Offset.
For example, if the Read address contains a value of 3 and the Offset is set to
4, the Word Lamp will display state 7 (4 + 3 = 7).
LSB: Displays the state represented by the least significant bit in the binary word.
|
Decimal |
Binary |
Displayed state |
|
0 |
0000 |
State
0 is displayed. All the bits are 0. |
|
1 |
0001 |
State
1 is displayed. The least significant active bit is 1. |
|
2 |
0010 |
State
2 is displayed. The least significant active bit is 2. |
|
3 |
0011 |
State
1 is displayed. The least significant active bit is 1. |
|
4 |
0100 |
State
3 is displayed. The least significant active bit is 3. |
|
5 |
0101 |
State
1 is displayed. The least significant active bit is 1. |
|
Decimal |
Binary |
Displayed state |
|
6 |
0110 |
State
2 is displayed. The least significant active bit is 2. |
|
7 |
0111 |
State
1 is displayed. The least significant active bit is 1. |
|
8 |
1000 |
State
4 is displayed. The least significant active bit is 4. |
Note: The LSB mode does not work with 32-bit Float data
format.
Bit combination: The state of the Word Lamp is displayed according to discrete bits rather than the value in a PLC or HMI register. One to four bits are used, depending on the number of states selected (1-16). The selected bits can be non-consecutive.
Bit 1 = least significant bit (LSB)
Bit 2 = next significant bit
Bit 3 = next significant bit
Bit 4 = most significant bit (MSB)
The binary value represented by the bits selected determines the state of the
Word Lamp.
|
Bit 4 |
Bit 3 |
Bit 2 |
Bit 1 |
State |
|
0 |
0 |
0 |
0 |
0 |
|
0 |
0 |
0 |
1 |
1 |
|
0 |
0 |
1 |
0 |
2 |
|
0 |
0 |
1 |
1 |
3 |
|
0 |
1 |
0 |
0 |
4 |
|
0 |
1 |
0 |
1 |
5 |
|
0 |
1 |
1 |
0 |
6 |
|
0 |
1 |
1 |
1 |
7 |
|
1 |
0 |
0 |
0 |
8 |
…and so
forth.
Change state by time:
The state of the Word Lamp increments automatically at the interval specified
by the Time interval. After the last
state (up to 96 states), the Word Lamp returns to state 0 and repeats.