Table of Contents
Advertisement
Rung 2:0
If this is the first scan or the error bit is true, the MSG instruction's control
byte is cleared and the done bit is set.
starts correctly and recovers from a MSG error.
|
First
|
Scan
|
Bit
|
S:1
|–+––––] [–––––+––––––––––––––––––––––––––––––––––––––+–+BITWISE AND
| |
15
|
| |
|
| |
|
| |
|
| |
|
| |
|
| |
|
| | MSG Block
|
| | Error (ER) |
| | Bit
|
| |
N15:0
|
| +––––] [–––––+
|
12
Rung 2:1
When the MSG instruction is done, the TON provides a 2 second delay before another
message is sent.
B3:0/0 represents user logic.
provide control over DH485 network loading.
| User
|MSG Block
| DH485
|Done (DN)
| Enable
|Bit
|
B3:0
N15:0
|––––] [––––––––] [––––––––––––––––––––––––––––––––––+TIMER ON DELAY
|
0
13
|
|
|
|
DH–485 Messaging with a SLC5/03 Interface
The following example uses the DH–485 communications mode to
send a message from an SLC5/03 to the Serial Communications
Module.
This ensures that the program always
Configuring and Interfacing
+AND–––––––––––––––+
| |Source A
| |
| |Source B
| |
| |Dest
| |
| +––––––––––––––––––+ | |
| MSG Block
| Done (DN)
| Bit
|
N15:0
+––––(L)–––––––––––––––+ |
13
The timer can be adjusted to
+TON–––––––––––––––+
|Timer
T4:0+–(DN) |
|Time Base
0.01|
|Preset
200|
|Accum
156|
+––––––––––––––––––+
1203–5.5 September 1995
4–13
|
|
|
|
+–+–|
255| | |
| | |
N15:0| | |
8192| | |
N15:0| | |
8192| | |
| |
| |
| |
| |
|
|
|
|
|
+–(EN)–|
|
|
|
|
Advertisement
Table of Contents
