Rockwell Automation T8110B/T8110 Trusted TMR Processor - Manual (Page 17)

Trusted
TM
TMR Processor T8110B/T8110
Issue 18 Feb 08 PD-T8110B/T8110 17
Typing IRIG S from the MP diagnostics will list the status of the IRIG port.
Typing IRIG I from the MP diagnostics will give a detailed list of the IRIG registers. The most useful
is the Status Register, which can be decoded as follows:
Bit Description
7 (Zero)
6 (Interrupt valid)
5 No License (goes low when valid IRIG dongle license found)
4 Control fields available, high when data found in control fields
3 Time valid (Only valid for that second)
2 IRIG-B122 input present (can sometimes be asserted erroneously)
1 IRIG-B002 input present
0 (Interrupt enable)
The IRIG B signal is a pulse width modulated signal that transmits 100 pulses per second. For the
IRIG-B002 signal this is directly output at RS422 levels. For the IRIG-B122 signal this pulse train is
amplitude modulated onto a 1KHz carrier.
The TMR Processor can accept IRIG-B122 inputs with a level between 0.25V to 10V PK-PK for the
mark signal, although at 0.25V it may be very close to the noise margin.
The TMR Processor accepts the IRIG-B002 signal at RS422 levels. RS422 is a differential signal pair.
A signal level of about 1.5V should be measurable across the termination resistor.
3.1.8. Additional User Serial Ports
Later versions of the TMR Processor are also fitted with three serial communications ports. These
ports may only be accessed via a Processor Interface Adaptor Unit (812X), if this is fitted to the rear of
the chassis. The values shown in the Additional User Serial Ports Window of the display are the
default values. They may be edited to suit user requirements as necessary.
RS485fd = full duplex for point to point
RS485fdmux = full duplex for multidrop
RS485hdmux = half duplex (2 wire) for multidrop
The Protocols area can be used to configure the three ports to respond as slaves to Modbus protocol.
On selecting Modbus, a window Main Processor Modbus Slaves is displayed. Three slaves are
available, one allocated to each port. Check Use This Slave to enable a slave, and enter the Slave
Address.
Once all required data has been entered, the user must select the OK button to enter the data in the
System.INI file.