Connecting
3.1 Pin assignment
Technology module TM FAST (6ES7554-1AA00-0AB0)
18 Equipment Manual, 04/2023, A5E52301130-AA
Digital inputs DIm and DIQm
Up to 12 digital inputs are available. Four DIQm can be used either as digital input or digital
output. Here, the digital input is permanently connected to the digital output of the DIQm.
The digital inputs are not isolated from each other. The digital inputs are electrically isolated
from the backplane bus.
RS485/TTL inputs and outputs
Eight RS485/TTL channels are available. These can be used as inputs or outputs. For each
channel, set whether it should be used as RS485, RS422 or TTL interface
(RS485_OR_TTL_DIRECTION system logic parameter).
The TTL interface is special in that two CHm form a TTL group:
• CH0 & CH1: TTL Group 0
• CH2 & CH3: TTL Group 1
• CH4 & CH5: TTL Group 2
• CH6 & CH7: TTL Group 3
If one channel is to be used as TTL interface, the second channel of the TTL group must also
be set as TTL interface. The channels of a TTL group can have different directions.
A RS485 or RS422 signal each uses one pair of lines. A signal with TTL standard uses a single
line connected to terminal +CHm (terminal -CHm must not be used). The RS485/TTL
inputs/outputs are not isolated from each other. The RS485/TTL inputs/outputs are isolated
from the backplane bus.
Considering the delay time after direction change of a RS485 channel
If you have set RS485_bidir for the RS485_OR_TTL_DIRECTION system logic parameter of an
RS485 channel, you need to consider the following:
When switching direction (between receiving and sending) on an RS485 channel, you need
to maintain a time interval of at least 1.5 µs between the RS485_OE signal and receiving or
Note
Behavior of the RS485/TTL channels (CHm)
no TM FAST application is loaded into the FPGA and activated, the RS485/TTL
channels are switched as outputs and output a low level.
In the description of the front connector and the logic, "channel" refers to an RS485/TTL
channel. In the diagnostics, however, "channel 0" refers to the entire module.
You can find additional information about the system logic parameters in the programming
manual Creating a TM FAST Application
(https://support.industry.siemens.com/cs/ww/en/view/109816088).
To Next Page
Loading...
