Specifications

89
Schneider Electric
Diagnostic tools
List of diagnostic tests
Control:
b Are the frames received/sent compatible with the functions supported by the
control system / products?
b Is the frame format the same for all the products connected?
b Is the maximum number of slaves respected?
b Does each product have a single and correct address?
b etc.
Serial link (RS232):
b Does the software manage the control signals (RTS/CTS)?
b Is the link "crossed" (2 and 3 on RS232)?
b Is the communication speed compatible?
b Are there parameters to be set for the interface (speed, frame format, DTE/DCE,
etc.)?
b Are the Rx and/or Tx LEDs on the interface blinking?
b etc.
Asynchronous link (RS485):
b Is the 2 wire / 4 wire configuration taken into account correctly?
b Are the L+ and L- connections inverted?
b Is the line polarised at the interface (or elsewhere, but not at 2 points)?
b Does the line have polarisation resistance at both ends?
b Is maximum network length respected (with EMC taken into account)?
b etc.
Products connected:
b Are the frames received/sent compatible with the functions supported by products
and/or by the control system?
b Is the correct format used (number of data bits, stop, parity bits, etc.).
b Are parameters set correctly (speed, address, 2 wires / 4 wires, etc.)?
b etc.
Note:
b Connect modules one by one in order to identify any "problem" modules.
b Use communication LEDs as an initial indicator.
b etc.
Implementation in Products