Instruction Manual

322 Publication 1753-UM001C-EN-P - March 2010
Appendix B System Signal Variables
Digital Relay Output Parameters for 1753-OW8 Modules
The 1753-OW8 module supports these digital output parameters.
I/O Data Read/Write Description
DO.Error Code Read Error mask for all digital outputs
0x0001 Module error
0x0002 MEZ test, safety switch 1 failed
0x0004 MEZ test, safety switch 2 failed
0x0008 FTZ test of test pattern failed
0x0010 MEZ test of test of readback channels failed
0x0020 MEZ test, active disconnection failed
0x0040 Error with initialization: relays
0x0080 FTZ test: error of relay voltage
0x0100 FTZ test of chip select (cs) signals failed
0x0400 FTZ test: 1. Temperature threshold exceeded
0x0800 FTZ test: 2. Temperature threshold exceeded
0x1000 MEZ test: status of safety switch 1
0x2000 MEZ test: status of safety switches
0x4000 MEZ test: active disconnection by watchdog failed
DO[xx].Error Code
(1)
Read Error code of digital output channels
0x01 Error in the digital output module
0x04 Error reading back the digital outputs
0x10 Error reading back relay [x].1 (The channel is permanently
deactivated.)
0x20 Error reading back relay [x].2 (The channel is permanently
deactivated.)
0x80 Channel cannot be activated after deactivation by:
• user program
• forcing
• channel/module failure
DO[xx].Value Write Output value for DO channels
0 Output not powered.
1 Output activated.
(1) xx = affected output channel of the controller or module.