3.6
The standard relay output defaults are as follows:
1.3 CAL IN PROG (Calibration in progress)
1.4 MAINTENANCE
1.5 FAILURE
All other relays are unassigned, except (where external autocalibration is fitted):
0.1 GROUP 1 SAMPLE/CAL
0.2 GROUP1 CAL1/CAL2
The standard analogue output defaults are:
1.1 TXD (transducer) 1
1.2 TXD 2
2.1 TXD 3
2.2 TXD 4
All other extra analogues are unassigned. The R1 defaults for each analogue are:
L=0%FSD, U=100%FSD (Gfx's have variable low ranges, so their R1 limits will need to be
individually set in L1), 4-20mA, LOW LIMIT 3.6mA, FREEZE, JAM LOW
3.2.2. Analogue inputs
Plug PL5 provides the electrical connections for the analogue inputs, the autocalibrate initiate
input (function detailed in Section 3.4) and the range change input. The connection details for
PL5 are summarised in Table 3.3.
Each analogue input signal consists of an analogue current input (for example pins 1 and 2 on
PL5 for analogue input 1) plus a digital status input (for example pins 9 and 10 on PL5 for
analogue input 1). The status input defines the validity of the analogue input signal. A high
input, or open circuit, on the digital signal indicates that the data is invalid. A low input, or short
circuit, on the digital signal indicates that the data is valid. Connection in this way ensures that
disconnection of the analogue input source or removal of the connector from PL5 will result in
an invalid measurement indication. If no suitable status indication is available from the source
of the analogue input signal then the status input pin should be shorted to the neighbouring
ground pin within the PL5 connector.
The external range change input is located at pins 13 and 14 of connector PL5 (see Table 3.3).
The second analogue output range for all outputs is obtained by shorting these two pins
together or by providing a digital low signal to pin 14.
NOTE
If the analogue input status signal is not connected then the digital line will be pulled
high internally. This indicates that the data is invalid and no reading will be
measured.
To Next Page
Loading...
