Maintenance table

At a Glance

The following section shows the maintenance table for safety modules.

Faults	Possible causes	Check
Unsolicited opening of safety outputs	No external supply or fuse F1 blown	Read %Ix.MOD.ERR = external fault Check I/O LED on the module Voltage >19.2 Vdc between terminals A1-A2 If %Ix.27 = 0 then SC1 on SS2
	SS ESD or PS contact open	Read %Ix.0 to %Ix.23 Check consistency of contact status
	B1 disconnected	Check B1 linked to: S232 for (single contact) S121 for (double contact)
	Loss of relay control F2 Fuse blown	Read %Ix.26 Check F2 status and characteristics
Start-up impossible	No external supply or fuse F1 blown	Read %Ix.MOD.ERR = external fault Check I/O LED on the module Voltage >19.2 Vdc between terminals A1-A2
	Emergency stop remains open	Read %Ix.0 to %Ix.23 Check consistency of contact status
	Inconsistency between double contact inputs (wires cut or inoperative SS ESD): self-check	Read %Ix.0 to %Ix.23 Check consistency of contact status
	No SS ESD action possible with feedback loop closed	%Ix.24 = %Ix.25 = 1 on PB action Check PB contacts Check Y3-Y4 shunt status
	Feedback loop remains open. Control is impossible.	Read %Ix.25 Check auxiliary relay contacts Read %Ix.26 on PB action
	Fuse F2 blown	Check F2 status and characteristics
	Output supply not functioning	Check reactivation wiring
Automatic start-up	Permanent PB activation with a closed loop	%Ix.24 = %Ix.25 = 1 without PB action Check PB contacts
False input data	Voltage drop on cables	Voltage between terminals S01-S112 and S121-S232 > 18.2 Vdc: all SS ESD closed

Legend :
(1)SC	Short circuit
(2)SS	Safety system

NOTE: If the fault persists, following wiring check, the module must be changed.

To avoid errors when replacing a product, it is recommended to mark the slot on the module label on the front panel and the TSX CPP •02 cable label. The red color of the TSX PAY 262 module front panel allows errors to be avoided during PLC maintenance operations.