2100-A
16
Analogue Signal Converted to Frequency for a PLC, using a TWI-FO.
Description
.
The TWI-FO converts 4~20mA from a 2100-AO to a frequency output. (Typically 10~1010Hz, but this is rangeable.)
A PLC with two digital outputs and one digital input can receive sixteen multiplexed analogue inputs.
14.02-20
Section F. Communications.
2100-A
16
‘PLC Message’ Communication Protocol.
‘Read Only From 2100-A
16
’ and ‘Read and Write to 2100-A
16
’ Protocols are both available from Intech Instruments in
‘WORD’ format, free of charge.
Read Message is PLC compatible read DM area. 2100-A
16
protocol is the protocol used by Microscan to access data
in stations. Both protocols use ASCII, except 2100-A
16
uses IEEE754 to represent floating point numbers.
2100-A
16
‘Modbus RTU/TCP’ Communication Protocol.
Note 1: This section only applies to an 2100-A16 with Modbus RTU Protocol.
Note 2: Can be used on Modbus TCP with a Modbus TCP to RTU Bridge. ie Schneider Electric ‘174 CEV 300 20’.
Note 3: 2100-ME Memory Board cannot be used when Modbus RTU protocol is used.
Modbus RTU Comms Specifications:
Error Check
Standard Modbus CRC.
End of message framing delay
Min 5msec, Max 7.5msec. (Minimum spec is 3.5msec at 9600 baud).
Counting is based on internal 2.5 msec timer.
Product Liability.
Due to ongoing research and development, designs, specifications, and documentation are subject to change without notification.
2100-A
16
Rev. 1 PLC RTX Fail Safe System
The PLC uses one channel of the 2100-A
16
to verify that the A16 is reading the channel correctly, AO1 is working and
the clock and reset/BCD channel select is working.
Test Channel = spare channel on 2100-A
16
, set to RTD 0-850C. This has a PLC relay connected which is used to short
out A-B, under the PLCs command. Do not use channel 1 as the test channel.
Sequence of operation.
1.
The PLC reads the required channels as normal.
2.
The PLC then advances to the test channel (the next free channel or channel 16)
3.
The test channel is read.
4.
The relay changes state to alter the reading of the test channel.
5.
1. to 4. are repeated. If the reading on the test channel does not alternate between 4 mA and 10 mA as the relay
changes state, within the specified tolerances as listed below then there is a fault in the system. The PLC software
should be setup to detect these values as the relay changes state.
e
t
a
t
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4
.
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5
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0
1
-
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+
0
2
3
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A
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1
.
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5
.
0
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5
.
9
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b
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T
Eg. 2100-A
16
20V
O/P 4~20mA
COM.
49
61
60
1
2
3
P/S2
F/O
COM2
4
5
6
eg. PLC
24Vdc
D/I
COM
1600V Isolation
TWI-FO
P/S1
I/P
COM1
PLC
Analog in -
Analog in +
COM
RST Out
CLK Out
Test relay
Clean Contacts,
Normally Open
60 AO COM
61 AO 1
54 DI COM
55 DI 1 (RST)
56 DI 2 (CLK)
220R
A
Test Channel.
B
(Eg.Channel 16)
B
46
47
48
2100-A
16
