Section E. Connecting to a PLC.
Connecting to a PLC as an Intelligent Multiplexer.
To set up the 2100-A
16
as an intelligent multiplexer a free software CD is available from Intech Instruments. Place the
CD into the drive and follow the instructions. The analogue output mode must be selected as either Mode 3 or Mode 4.
This is set in the Station Advanced Dialog Box ‘AO 1 & AO 2 button’. For detailed programming info, refer to ‘Programming
2100-Series Remote Station’ in the Microscan Manual.
14.02-16
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2100-A
16
TXE and TX Delay Settings.
The TXE and TX delays are software selectable in the MicroScan Outstation Programming Box. These delays are used
for RS485/RS232 operation, to control the behaviour of the transmitter on the outstation, when it is ready to send data.
The TXE delay controls how long the transmitter waits before turning on. The TX delay controls how long the transmitter
waits before sending data. If the TXE delay is zero, the transmitter turns on immediately. If the TX delay is zero, the
data is sent immediately, upon receiving a command.
RX
The period is specified in
TXE
units of 2.5ms.
i.e. 10units = 25ms
TX
TXE delay TX delay
2100-A
16
Delay Settings Table.
Mode 3. 2100-A
16
Clock and Reset Channel Selection Mode, PLC Installation Guide.
Mode 3.
PLC RTX, CLOCK & RESET Channel Select.
DI COM = CS COM
DI 1 = RESET input.
DI 2 = CLOCK input.
Issue a RESET pulse to select channel 1.
Issue a CLOCK pulse to advance to the next channel.
Specifications
.
Clocking speed
-Reset pulse length
20msec.
-Clock pulse length
20msec.
Settling times before reading
100msec Min. Multiple readings with averaging recommended.
-Note. Longer times may be required for longer cable lengths and higher resolution.
Binary signal magnitude
-All models
5~30Vdc.
Cycle TIme
4sec minimum to cycle through all 16 inputs.
Resolution
12bits, 4000 steps typical.
Sequence
:
S R
{
{
S R
{
{
S R
{
{
S R
{
{
S R
{
{
S R
{
{
S R
{
{
S R
{
{
S R
{
{
Operation.
Key: S = Settling time.
R = Read value.
Reset
Clock
Channel
1
2
3
4
5
15
16
1
2
Apply a Clock pulse to
advance multiplexer to
channel two.
Each clock advances
the Multiplexer
another channel
Multiplexer output
= channel one.
Apply a Reset pulse
to reset 2100-A
16
intelligent multiplexer.
Multiplexer output
= channel sixteen.
(Or highest channel
number used.)
Multiplexer output
= channel two.
Apply
power.
Note. All TXE and TX Delays are Software Selectable. The Factory Default TXE Setting is 10(25ms).
