SATEC 1771DB - Manual (Page 10)

10
5 TROUBLESHOOTING
This chapter describes common problems you might encounter during installation of the
communication driver and offers suggestions for corrective action.
The processor doesn't interface to the BASIC module
The symptom indicating the problem is that the address of the instrument being polled that is
located in word 1 in the processor input data file is still unchanged while you are monitoring the
file.
When you are using the driver with the E option, the problem may be located in the BASIC
module or in the processor. If you are using the driver without the E option, then the problem
may be also related to the improper operation of the communication network. Once the driver
doesn't transmit data unless it receives a correct response from the Powermeter, the
processor may not receive data from the BTR buffer when the network doesn't operate
properly.
Note that the BASIC module requires CTS (pin 5) on the peripheral port connector to be true
before date can be output. To satisfy this requirement, pin 5 should be connected to pin 4. The
BASIC module driver will not interface to the PLC processor if there is no jumper between
the peripheral port pins 4 and 5.
To ensure that the BASIC module operates properly, carry out the following procedure:
1. Switch the power supply off.
2. Unplug the network connector from the BASIC module peripheral port.
3. Jumper the peripheral port pins 4 and 5.
4. Turn power on.
If on power up, LED XMTG located on the front panel of the BASIC module doesn't flash, it
could be for one of the following reasons:
1. Incorrect setting for the user PROM size jumper.
2. Improper EPROM installation.
For information on the jumper setting for the PROM size jumper, see Section 2.1. For
additional information on EPROM location and jumper pin assignments, refer to the 1771-DB
BASIC Module User's Manual.
If on power up, LED XMTG flashes three times with short intervals, for about 1/2 of a
second, between flashes, what means that the driver requests the instrument, then the BASIC
module operates properly.
Then, use the following guidelines to solve the problem.
If you are using the driver without the E option, then you should attach the communication
connector to the BASIC module peripheral port. On how to check whether the communication
network operates properly, refer to the next paragraph.
If you still have a problem, determine whether one of the following is the cause: