Troubleshooting - ABB TMD-T4 Instruction Manual

Reset Max temperature register (write only)
register 0x27F, 2 byte wide; write the 0xA55A value in these register to reset the peak temperature registers; only
the value 0xA55A is accepted; other value are discarded
Alarm and Trip status register (read only)
Trip signalling led status: MSByte of register 0x270 (read only)
- TMD-T8: from bit 0 (CH1) to bit 7 (CH8): 0 = led OFF; 1 = led ON
- TMD-T4: from bit 0 (CH1) to bit 3 (CH4): 0 = led OFF; 1 = led ON
Alarm signalling led status: LSByte of register 0x270 (read only)
- TMD-T8: from bit 0 (CH1) to bit 7 (CH8): 0 = led OFF; 1 = led ON
- TMD-T4: from bit 0 (CH1) to bit 3 (CH4): 0 = led OFF; 1 = led ON
Relay and HOLD status (read only)
MSByte of register 0x271 (read only)
- bit 0 FAULT relay
- bit 1 FAN relay
- bit 2 ALARM relay
- bit 3 TRIP relay
- bit 4 unused
- bit 5 HOLD MODE (active LOW 0 = HOLD active)
- bit 6 unused
- bit 7 unused
LSB byte : unused
FAN status register (read / write)
MSByte of register 0x274:
Number of ACTIVE channel
-value 0x00 : 3 channel, display mean
-value 0x01 : 4 channel, display mean
LSByte of register 0x274:
FAN mode
- value 0x00 : active on CH1÷3, display mean
- value 0x01 : disabled, display mean
- value 0x02 : only on CH 4, display mean

TROUBLESHOOTING

If response from TMD doesn't happen:
- check connection from TMD and RS232/RS485 converter or other interface if used;
- check if data outgoing from the RS232 serial port of the PC or PLC come in the RS232/485 converter
- try to increase the wait time for response ( 30 mS is good);
- check if the transmitted data stream is EXACTLY as in example, monitoring the data on the RS485 serial line
with a terminal ( eg. Hyperterminal or other terminal emulator);
- if the RS232/485 converter is not our model CUS, be sure the automatic turnaround-time is set in range 1 to 2 mS
protocol communication - instruction manual
TMD-T4
(active LOW 0 = relay energized)
(active HIGH 1 = relay energized)
(active HIGH 1 = relay energized)
(active HIGH 1 = relay energized)
IM148-U-AB v0.92 pag. 11 / 12