Example: Current Consumed by a Remote Configuration

Introduction

This example is for a remote configuration (TM5 Receiver module and its expansion modules). From this example, you should be able to make the calculations necessary for your TM5 System.

In a remote configuration, the TM5SBER2 Receiver module connects:

odirectly the external power supply to the 24 Vdc I/O power segment.

othe external power supply to the internal power supply that generates the power distributed on the TM5 power bus.

All current consumption values are documented in the TM5 Consumption Table.

Planning Example

This configuration example includes:

oThe TM5SBER2 Receiver module.

oSome expansion slices:

oTM5SAI4L

oTM5SDI12D

oTM5SDI4D

oTM5SDM12DT

oTM5SDI4A

oTM5SDO12T

oTM5SDO2T

oTM5SDO2R

oAssumptions used for the purposes of calculating the consumption of this example:

TM5SBER2: The maximum current distributed on the 24 Vdc I/O power segment is limited by an external isolated power supply of 6300 mA.

TM5SDI4D: The current to supply the electronic sensors of this example has been estimated at 50 mA per sensor, or 200 mA total for the module.

TM5SDM12DT: The sum of the current draw for all outputs connected to the module is not more than 1500 mA at any given time.

TM5SDO12T: Only 50 % of the outputs are active at any given time, and that the maximum current draw of any given output is 500 mA, or 3000 mA total for the module.

TM5SSDO2T: The sum of the current draw for all outputs connected to the module is not more than 600 mA at any given time.

The following table shows the current supplied and consumed in mA on the TM5 power bus and the 24 Vdc I/O power segment:

TM5SBER2	TM5SAI4L	TM5SDI12D	TM5SDI4D	TM5SDM12DT	TM5SDI4A	TM5SDO12T	TM5SDO2T	TM5SDO2R	Legend
1156									(1)
26	26	26	26	26	26	26	26	26	(2)
–	2	36	28	42	34	52	26	90	(3)
26	28	62	54	68	60	78	52	116	(4)
1130	1102	1040	986	918	858	780	728	612	(5)
6300 maximum									(6)
25	46	73	25	46	–	48	14	–	(7)
–	–	–	–	1500	–	3000	600	–	(8)
–	–	–	200	–	–	–	–	–	(9)
25	46	73	225	1546	0	3048	614	0	(10)
6275	6229	6156	5931	4385	4385	1337	723	723	(11)
Legend: External isolated main power supply, 24 Vdc (1) Current supplied on TM5 power bus, in mA (2) Consumption of the bus base, in mA (3) Consumption of the electronic module, in mA (4) Sum of (2) and (3), in mA (5) Remaining current available after slice consumption, in mA External isolated I/O power supply, 24 Vdc (6) Current supplied on the 24 Vdc I/O power segment, in mA (7) Consumption of the electronic module, in mA (8) Consumption of the loads of the output slices, in mA (9) Consumption of the supply to sensors, actuators or external devices, in mA (10) Sum of (7), (8) and (9), in mA (11) Remaining current available after slice consumption, in mA

Current Consumed on the 24 Vdc I/O Power Segment

The 24 Vdc I/O power segment begins with the TM5SBER2 Receiver module and finishes with the TM5SDO2R expansion module. The capacity of this 24 Vdc I/O power segment is limited to 6300 mA in this example.

The total current consumed on the 24 Vdc I/O power segment is 5577 mA, and does not exceed the 6300 mA capacity of this segment.

The following step is to calculate the current consumed on the TM5 power bus to validate the configuration of the example.

Current Consumed on the TM5 Power Bus

The TM5SBER2 Receiver module generates 1156 mA on the TM5 power bus to supply remote expansion I/Os. The TM5 power bus begins with the TM5SBER2 remote expansion module and terminates with the TM5SDO2R remote expansion module.

The total current consumed on the TM5 power bus is 544 mA, and does not exceed the 1156 mA capacity of the TM5 power bus.

Final Configuration of the Example

This configuration does not need an additional PDM for power distribution.

Depending on the application, a PDM can be inserted to create separated groups.