Rievtech x-Messenger Series - Modbus Read

291
Overflow
X
0
0
Zero
division OR
Overflow
1
0
1
Zero
division OR
Overflow
0
1
1
Zero
division OR
Overflow
1
1
1
Zero
division OR
Overflow
0
0
0
If the Referenced Analog Math FB is null, then the output is always 0.
6.5.32 Modbus Read
Short description:
When there is a high level at En, the Modbus Read block will be activated and the x-Messenger shall
communicate with a peripheral device as a master via RS232 or RS485 interface. Furthermore, the output will
be switched on when communication is established successfully. Otherwise the output (Q pin) remains “off”
which means communication has failed.
A signal at input R resets output Q and disables this block at the same time
Connection
Description
Input En
A high signal at En input will enable “Modbus Read” function block to be activated
Input R
Reset the value read from peripheral and set the output to 0 via the R (Reset)
input.
Reset has priority over En